31890761245 has 64 divisors (see below), whose sum is σ = 45979508736. Its totient is φ = 20778693120.

The previous prime is 31890761213. The next prime is 31890761257. The reversal of 31890761245 is 54216709813.

It is not a de Polignac number, because 31890761245 - 2⁵ = 31890761213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31890761195 and 31890761204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15308974 + ... + 15311056.

It is an arithmetic number, because the mean of its divisors is an integer number (718429824).

It is a 2-persistent number, because it is pandigital, and so is 2⋅31890761245 = 63781522490, but 3⋅31890761245 = 95672283735 is not.

Almost surely, 2^31890761245 is an apocalyptic number.

31890761245 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

31890761245 is the 145810-th pentagonal number.

It is an amenable number.

31890761245 is a deficient number, since it is larger than the sum of its proper divisors (14088747491).

31890761245 is a wasteful number, since it uses less digits than its factorization.

31890761245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2410.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 31890761245 in words is "thirty-one billion, eight hundred ninety million, seven hundred sixty-one thousand, two hundred forty-five".