31610442138 has 64 divisors (see below), whose sum is σ = 71459701632. Its totient is φ = 9237473280.

The previous prime is 31610442137. The next prime is 31610442179. The reversal of 31610442138 is 83124401613.

It is a super-2 number, since 2×31610442138² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 31610442099 and 31610442108.

It is not an unprimeable number, because it can be changed into a prime (31610442131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 218670 + ... + 333222.

It is an arithmetic number, because the mean of its divisors is an integer number (1116557838).

Almost surely, 2^31610442138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31610442138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35729850816).

31610442138 is an abundant number, since it is smaller than the sum of its proper divisors (39849259494).

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

31610442138 is a wasteful number, since it uses less digits than its factorization.

31610442138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114719.

The product of its (nonzero) digits is 13824, while the sum is 33.

The spelling of 31610442138 in words is "thirty-one billion, six hundred ten million, four hundred forty-two thousand, one hundred thirty-eight".