31373381831 has 4 divisors (see below), whose sum is σ = 34225507464. Its totient is φ = 28521256200.

The previous prime is 31373381789. The next prime is 31373381849. The reversal of 31373381831 is 13818337313.

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 31373381831 - 2¹⁴ = 31373365447 is a prime.

It is a super-2 number, since 2×31373381831² (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 (31373381131) 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 3 ways as a sum of consecutive naturals, for example, 1426062800 + ... + 1426062821.

It is an arithmetic number, because the mean of its divisors is an integer number (8556376866).

Almost surely, 2^31373381831 is an apocalyptic number.

31373381831 is a deficient number, since it is larger than the sum of its proper divisors (2852125633).

31373381831 is a wasteful number, since it uses less digits than its factorization.

31373381831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2852125632.

The product of its digits is 108864, while the sum is 41.

The spelling of 31373381831 in words is "thirty-one billion, three hundred seventy-three million, three hundred eighty-one thousand, eight hundred thirty-one".