31154349918 has 16 divisors (see below), whose sum is σ = 62763509520. Its totient is φ = 10308981696.

The previous prime is 31154349917. The next prime is 31154349937. The reversal of 31154349918 is 81994345113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31154349917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18949513 + ... + 18951156.

It is an arithmetic number, because the mean of its divisors is an integer number (3922719345).

Almost surely, 2^31154349918 is an apocalyptic number.

31154349918 is an abundant number, since it is smaller than the sum of its proper divisors (31609159602).

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

31154349918 is a wasteful number, since it uses less digits than its factorization.

31154349918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37900811.

The product of its digits is 466560, while the sum is 48.

The spelling of 31154349918 in words is "thirty-one billion, one hundred fifty-four million, three hundred forty-nine thousand, nine hundred eighteen".