31377536381 has 16 divisors (see below), whose sum is σ = 31894248960. Its totient is φ = 30864498240.

The previous prime is 31377536371. The next prime is 31377536387. The reversal of 31377536381 is 18363577313.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31377536381 is a prime.

It is a super-2 number, since 2×31377536381² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31377536387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30731651 + ... + 30732671.

It is an arithmetic number, because the mean of its divisors is an integer number (1993390560).

Almost surely, 2^31377536381 is an apocalyptic number.

It is an amenable number.

31377536381 is a deficient number, since it is larger than the sum of its proper divisors (516712579).

31377536381 is a wasteful number, since it uses less digits than its factorization.

31377536381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2356.

The product of its digits is 952560, while the sum is 47.

The spelling of 31377536381 in words is "thirty-one billion, three hundred seventy-seven million, five hundred thirty-six thousand, three hundred eighty-one".