31408641 has 20 divisors (see below), whose sum is σ = 51185904. Its totient is φ = 19035000.

The previous prime is 31408631. The next prime is 31408649. The reversal of 31408641 is 14680413.

31408641 is a `hidden beast` number, since 3 + 14 + 0 + 8 + 641 = 666.

It is not a de Polignac number, because 31408641 - 2⁷ = 31408513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31408649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 16735 + ... + 18516.

Almost surely, 2^31408641 is an apocalyptic number.

It is an amenable number.

31408641 is a deficient number, since it is larger than the sum of its proper divisors (19777263).

31408641 is a wasteful number, since it uses less digits than its factorization.

31408641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35274 (or 35265 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 31408641 is about 5604.3412636991. The cubic root of 31408641 is about 315.5123634420.

It can be divided in two parts, 3140 and 8641, that added together give a triangular number (11781 = T₁₅₃).

The spelling of 31408641 in words is "thirty-one million, four hundred eight thousand, six hundred forty-one".