31211320290 has 64 divisors (see below), whose sum is σ = 75148819200. Its totient is φ = 8296221440.

The previous prime is 31211320241. The next prime is 31211320291. The reversal of 31211320290 is 9202311213.

It is a self number, because there is not a number n which added to its sum of digits gives 31211320290.

It is not an unprimeable number, because it can be changed into a prime (31211320291) 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 31 ways as a sum of consecutive naturals, for example, 19065352 + ... + 19066988.

It is an arithmetic number, because the mean of its divisors is an integer number (1174200300).

Almost surely, 2^31211320290 is an apocalyptic number.

31211320290 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31211320290 is an abundant number, since it is smaller than the sum of its proper divisors (43937498910).

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

31211320290 is a wasteful number, since it uses less digits than its factorization.

31211320290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3307.

The product of its (nonzero) digits is 648, while the sum is 24.

The spelling of 31211320290 in words is "thirty-one billion, two hundred eleven million, three hundred twenty thousand, two hundred ninety".