31088729042 has 40 divisors (see below), whose sum is σ = 54495135600. Its totient is φ = 13300944552.

The previous prime is 31088729041. The next prime is 31088729047. The reversal of 31088729042 is 24092788013.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 31088728984 and 31088729002.

It is not an unprimeable number, because it can be changed into a prime (31088729041) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2967209 + ... + 2977667.

It is an arithmetic number, because the mean of its divisors is an integer number (1362378390).

Almost surely, 2^31088729042 is an apocalyptic number.

31088729042 is a deficient number, since it is larger than the sum of its proper divisors (23406406558).

31088729042 is an equidigital number, since it uses as much as digits as its factorization.

31088729042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11108 (or 11087 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 44.

The spelling of 31088729042 in words is "thirty-one billion, eighty-eight million, seven hundred twenty-nine thousand, forty-two".