31373408387 has 4 divisors (see below), whose sum is σ = 33218903016. Its totient is φ = 29527913760.

The previous prime is 31373408351. The next prime is 31373408413. The reversal of 31373408387 is 78380437313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78380437313 = 47 ⋅1667668879.

It is a cyclic number.

It is not a de Polignac number, because 31373408387 - 2¹² = 31373404291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31373408317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 922747289 + ... + 922747322.

It is an arithmetic number, because the mean of its divisors is an integer number (8304725754).

Almost surely, 2^31373408387 is an apocalyptic number.

31373408387 is a deficient number, since it is larger than the sum of its proper divisors (1845494629).

31373408387 is a wasteful number, since it uses less digits than its factorization.

31373408387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1845494628.

The product of its (nonzero) digits is 1016064, while the sum is 47.

The spelling of 31373408387 in words is "thirty-one billion, three hundred seventy-three million, four hundred eight thousand, three hundred eighty-seven".