31400091 has 12 divisors (see below), whose sum is σ = 45405360. Its totient is φ = 20910480.

The previous prime is 31400081. The next prime is 31400099. The reversal of 31400091 is 19000413.

It is not a de Polignac number, because 31400091 - 2²¹ = 29302939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31400099) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12445 + ... + 14753.

It is an arithmetic number, because the mean of its divisors is an integer number (3783780).

Almost surely, 2^31400091 is an apocalyptic number.

31400091 is a deficient number, since it is larger than the sum of its proper divisors (14005269).

31400091 is a wasteful number, since it uses less digits than its factorization.

31400091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3826 (or 3823 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 31400091 is about 5603.5784102661. The cubic root of 31400091 is about 315.4837314537.

The spelling of 31400091 in words is "thirty-one million, four hundred thousand, ninety-one".