31139422620 has 192 divisors, whose sum is σ = 95970631680. Its totient is φ = 7508996352.

The previous prime is 31139422603. The next prime is 31139422667. The reversal of 31139422620 is 2622493113.

It is a super-2 number, since 2×31139422620² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 16858537 + ... + 16860383.

It is an arithmetic number, because the mean of its divisors is an integer number (499847040).

Almost surely, 2^31139422620 is an apocalyptic number.

31139422620 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31139422620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47985315840).

31139422620 is an abundant number, since it is smaller than the sum of its proper divisors (64831209060).

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

31139422620 is a wasteful number, since it uses less digits than its factorization.

31139422620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2544 (or 2542 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The spelling of 31139422620 in words is "thirty-one billion, one hundred thirty-nine million, four hundred twenty-two thousand, six hundred twenty".