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1022401 = 8571193
BaseRepresentation
bin11111001100111000001
31220221110201
43321213001
5230204101
633525201
711455522
oct3714701
91827421
101022401
11639166
12413801
1329a493
141c8849
15152e01
hexf99c1

1022401 has 4 divisors (see below), whose sum is σ = 1024452. Its totient is φ = 1020352.

The previous prime is 1022389. The next prime is 1022429. The reversal of 1022401 is 1042201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1042201 = 2933557.

It can be written as a sum of positive squares in 2 ways, for example, as 767376 + 255025 = 876^2 + 505^2 .

It is a cyclic number.

It is not a de Polignac number, because 1022401 - 211 = 1020353 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1022491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261 + ... + 1453.

It is an arithmetic number, because the mean of its divisors is an integer number (256113).

21022401 is an apocalyptic number.

1022401 is the 640-th centered pentagonal number.

It is an amenable number.

1022401 is a deficient number, since it is larger than the sum of its proper divisors (2051).

1022401 is an equidigital number, since it uses as much as digits as its factorization.

1022401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2050.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1022401 is about 1011.1384672734. The cubic root of 1022401 is about 100.7411927600.

Adding to 1022401 its reverse (1042201), we get a palindrome (2064602).

The spelling of 1022401 in words is "one million, twenty-two thousand, four hundred one".

Divisors: 1 857 1193 1022401