31404671 has 4 divisors (see below), whose sum is σ = 31446072. Its totient is φ = 31363272.

The previous prime is 31404631. The next prime is 31404689. The reversal of 31404671 is 17640413.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31404671 - 2²² = 27210367 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31404671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31404631) 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, 19541 + ... + 21086.

It is an arithmetic number, because the mean of its divisors is an integer number (7861518).

Almost surely, 2^31404671 is an apocalyptic number.

31404671 is a deficient number, since it is larger than the sum of its proper divisors (41401).

31404671 is an equidigital number, since it uses as much as digits as its factorization.

31404671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41400.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 31404671 is about 5603.9870627973. The cubic root of 31404671 is about 315.4990694692.

The spelling of 31404671 in words is "thirty-one million, four hundred four thousand, six hundred seventy-one".