1020551 has 8 divisors (see below), whose sum is σ = 1204224. Its totient is φ = 846360.

The previous prime is 1020541. The next prime is 1020557. The reversal of 1020551 is 1550201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1020551 - 2¹⁴ = 1004167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020557) 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 7 ways as a sum of consecutive naturals, for example, 2135 + ... + 2568.

It is an arithmetic number, because the mean of its divisors is an integer number (150528).

2^1020551 is an apocalyptic number.

1020551 is a deficient number, since it is larger than the sum of its proper divisors (183673).

1020551 is an equidigital number, since it uses as much as digits as its factorization.

1020551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4741.

The product of its (nonzero) digits is 50, while the sum is 14.

The square root of 1020551 is about 1010.2232426548. The cubic root of 1020551 is about 100.6803934812.

Adding to 1020551 its reverse (1550201), we get a palindrome (2570752).

The spelling of 1020551 in words is "one million, twenty thousand, five hundred fifty-one".