31404649 has 4 divisors (see below), whose sum is σ = 31847040. Its totient is φ = 30962260.

The previous prime is 31404631. The next prime is 31404689. The reversal of 31404649 is 94640413.

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 31404649 - 2⁵ = 31404617 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 31404649.

It is not an unprimeable number, because it can be changed into a prime (31404689) 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, 221089 + ... + 221230.

It is an arithmetic number, because the mean of its divisors is an integer number (7961760).

Almost surely, 2^31404649 is an apocalyptic number.

It is an amenable number.

31404649 is a deficient number, since it is larger than the sum of its proper divisors (442391).

31404649 is an equidigital number, since it uses as much as digits as its factorization.

31404649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442390.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 31404649 is about 5603.9850999088. The cubic root of 31404649 is about 315.4989957967.

The spelling of 31404649 in words is "thirty-one million, four hundred four thousand, six hundred forty-nine".