31377358643 has 4 divisors (see below), whose sum is σ = 33223085640. Its totient is φ = 29531631648.

The previous prime is 31377358637. The next prime is 31377358687. The reversal of 31377358643 is 34685377313.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31377358643 - 2²⁰ = 31376310067 is a prime.

It is a super-2 number, since 2×31377358643² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31377358591 and 31377358600.

It is not an unprimeable number, because it can be changed into a prime (31377358633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 922863473 + ... + 922863506.

It is an arithmetic number, because the mean of its divisors is an integer number (8305771410).

Almost surely, 2^31377358643 is an apocalyptic number.

31377358643 is a deficient number, since it is larger than the sum of its proper divisors (1845726997).

31377358643 is a wasteful number, since it uses less digits than its factorization.

31377358643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1845726996.

The product of its digits is 3810240, while the sum is 50.

The spelling of 31377358643 in words is "thirty-one billion, three hundred seventy-seven million, three hundred fifty-eight thousand, six hundred forty-three".