31505051040 has 48 divisors (see below), whose sum is σ = 99240912288. Its totient is φ = 8401346816.

The previous prime is 31505051009. The next prime is 31505051041. The reversal of 31505051040 is 4015050513.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 31505051040.

It is not an unprimeable number, because it can be changed into a prime (31505051041) 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, 32817282 + ... + 32818241.

It is an arithmetic number, because the mean of its divisors is an integer number (2067519006).

Almost surely, 2^31505051040 is an apocalyptic number.

31505051040 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31505051040 is an abundant number, since it is smaller than the sum of its proper divisors (67735861248).

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

31505051040 is a wasteful number, since it uses less digits than its factorization.

31505051040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65635541 (or 65635533 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 24.

The spelling of 31505051040 in words is "thirty-one billion, five hundred five million, fifty-one thousand, forty".