56531997 has 12 divisors (see below), whose sum is σ = 81766620. Its totient is φ = 37637568.

The previous prime is 56531983. The next prime is 56532013. The reversal of 56531997 is 79913565.

It can be written as a sum of positive squares in 2 ways, for example, as 11655396 + 44876601 = 3414^2 + 6699^2 .

It is not a de Polignac number, because 56531997 - 2¹⁵ = 56499229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56531947) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3673 + ... + 11249.

It is an arithmetic number, because the mean of its divisors is an integer number (6813885).

Almost surely, 2^56531997 is an apocalyptic number.

It is an amenable number.

56531997 is a deficient number, since it is larger than the sum of its proper divisors (25234623).

56531997 is a wasteful number, since it uses less digits than its factorization.

56531997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8412 (or 8409 counting only the distinct ones).

The product of its digits is 255150, while the sum is 45.

The square root of 56531997 is about 7518.7762967121. The cubic root of 56531997 is about 383.7939364790.

The spelling of 56531997 in words is "fifty-six million, five hundred thirty-one thousand, nine hundred ninety-seven".