31371311478 has 48 divisors (see below), whose sum is σ = 67987501200. Its totient is φ = 9645996672.

The previous prime is 31371311467. The next prime is 31371311507. The reversal of 31371311478 is 87411317313.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1560700 + ... + 1580672.

It is an arithmetic number, because the mean of its divisors is an integer number (1416406275).

Almost surely, 2^31371311478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31371311478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33993750600).

31371311478 is an abundant number, since it is smaller than the sum of its proper divisors (36616189722).

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

31371311478 is a wasteful number, since it uses less digits than its factorization.

31371311478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21553 (or 21540 counting only the distinct ones).

The product of its digits is 42336, while the sum is 39.

The spelling of 31371311478 in words is "thirty-one billion, three hundred seventy-one million, three hundred eleven thousand, four hundred seventy-eight".