31585106940 has 48 divisors (see below), whose sum is σ = 88591669152. Its totient is φ = 8408088576.

The previous prime is 31585106929. The next prime is 31585106957. The reversal of 31585106940 is 4960158513.

It is a super-2 number, since 2×31585106940² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31585106892 and 31585106901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 421549 + ... + 490788.

It is an arithmetic number, because the mean of its divisors is an integer number (1845659774).

Almost surely, 2^31585106940 is an apocalyptic number.

31585106940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31585106940 is an abundant number, since it is smaller than the sum of its proper divisors (57006562212).

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

31585106940 is a wasteful number, since it uses less digits than its factorization.

31585106940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912926 (or 912924 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 42.

The spelling of 31585106940 in words is "thirty-one billion, five hundred eighty-five million, one hundred six thousand, nine hundred forty".