31404491 has 8 divisors (see below), whose sum is σ = 34025904. Its totient is φ = 28869120.

The previous prime is 31404487. The next prime is 31404521. The reversal of 31404491 is 19440413.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31404491 - 2² = 31404487 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 31404491.

It is not an unprimeable number, because it can be changed into a prime (31404431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20750 + ... + 22211.

It is an arithmetic number, because the mean of its divisors is an integer number (4253238).

Almost surely, 2^31404491 is an apocalyptic number.

31404491 is a deficient number, since it is larger than the sum of its proper divisors (2621413).

31404491 is a wasteful number, since it uses less digits than its factorization.

31404491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43021.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 31404491 is about 5603.9710027801. The cubic root of 31404491 is about 315.4984666932.

The spelling of 31404491 in words is "thirty-one million, four hundred four thousand, four hundred ninety-one".