31404913 has 4 divisors (see below), whose sum is σ = 32770368. Its totient is φ = 30039460.

The previous prime is 31404907. The next prime is 31404917. The reversal of 31404913 is 31940413.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31404913 - 2⁵ = 31404881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31404917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 682693 + ... + 682738.

It is an arithmetic number, because the mean of its divisors is an integer number (8192592).

Almost surely, 2^31404913 is an apocalyptic number.

It is an amenable number.

31404913 is a deficient number, since it is larger than the sum of its proper divisors (1365455).

31404913 is a wasteful number, since it uses less digits than its factorization.

31404913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1365454.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 31404913 is about 5604.0086545258. The cubic root of 31404913 is about 315.4998798643.

The spelling of 31404913 in words is "thirty-one million, four hundred four thousand, nine hundred thirteen".