31897897653 has 8 divisors (see below), whose sum is σ = 42531358816. Its totient is φ = 21264850800.

The previous prime is 31897897643. The next prime is 31897897679. The reversal of 31897897653 is 35679879813.

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

It is not a de Polignac number, because 31897897653 - 2⁵ = 31897897621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31897897643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224763 + ... + 338103.

It is an arithmetic number, because the mean of its divisors is an integer number (5316419852).

Almost surely, 2^31897897653 is an apocalyptic number.

It is an amenable number.

31897897653 is a deficient number, since it is larger than the sum of its proper divisors (10633461163).

31897897653 is a wasteful number, since it uses less digits than its factorization.

31897897653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207155.

The product of its digits is 68584320, while the sum is 66.

The spelling of 31897897653 in words is "thirty-one billion, eight hundred ninety-seven million, eight hundred ninety-seven thousand, six hundred fifty-three".