31231311432100 has 72 divisors (see below), whose sum is σ = 75339532905728. Its totient is φ = 11159575286400.

The previous prime is 31231311432067. The next prime is 31231311432103. The reversal of 31231311432100 is 123411313213.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (31231311432103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 387444954 + ... + 387525553.

Almost surely, 2^{31231311432100} is an apocalyptic number.

It is an amenable number.

31231311432100 is an abundant number, since it is smaller than the sum of its proper divisors (44108221473628).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31231311432100 is a wasteful number, since it uses less digits than its factorization.

31231311432100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774970565 (or 774970558 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 31231311432100 its reverse (123411313213), we get a palindrome (31354722745313).

The spelling of 31231311432100 in words is "thirty-one trillion, two hundred thirty-one billion, three hundred eleven million, four hundred thirty-two thousand, one hundred".