56515403 has 16 divisors (see below), whose sum is σ = 67200000. Its totient is φ = 46503072.

The previous prime is 56515399. The next prime is 56515421. The reversal of 56515403 is 30451565.

It is not a de Polignac number, because 56515403 - 2² = 56515399 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (56515453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39698 + ... + 41096.

It is an arithmetic number, because the mean of its divisors is an integer number (4200000).

Almost surely, 2^56515403 is an apocalyptic number.

56515403 is a deficient number, since it is larger than the sum of its proper divisors (10684597).

56515403 is a wasteful number, since it uses less digits than its factorization.

56515403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1634.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 56515403 is about 7517.6727116841. The cubic root of 56515403 is about 383.7563807574.

Adding to 56515403 its reverse (30451565), we get a palindrome (86966968).

The spelling of 56515403 in words is "fifty-six million, five hundred fifteen thousand, four hundred three".