1020540401 has 4 divisors (see below), whose sum is σ = 1048122612. Its totient is φ = 992958192.

The previous prime is 1020540373. The next prime is 1020540467. The reversal of 1020540401 is 1040450201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 857084176 + 163456225 = 29276^2 + 12785^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020540401 - 2²⁶ = 953431537 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1020540401.

It is not an unprimeable number, because it can be changed into a prime (1020540601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13791050 + ... + 13791123.

It is an arithmetic number, because the mean of its divisors is an integer number (262030653).

Almost surely, 2^1020540401 is an apocalyptic number.

It is an amenable number.

1020540401 is a deficient number, since it is larger than the sum of its proper divisors (27582211).

1020540401 is an equidigital number, since it uses as much as digits as its factorization.

1020540401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27582210.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 1020540401 is about 31945.8980308897. The cubic root of 1020540401 is about 1006.8004493900.

Adding to 1020540401 its reverse (1040450201), we get a palindrome (2060990602).

The spelling of 1020540401 in words is "one billion, twenty million, five hundred forty thousand, four hundred one".