31421745 has 12 divisors (see below), whose sum is σ = 54464436. Its totient is φ = 16758240.

The previous prime is 31421737. The next prime is 31421759. The reversal of 31421745 is 54712413.

It can be written as a sum of positive squares in 2 ways, for example, as 6110784 + 25310961 = 2472^2 + 5031^2 .

It is not a de Polignac number, because 31421745 - 2³ = 31421737 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 349086 + ... + 349175.

It is an arithmetic number, because the mean of its divisors is an integer number (4538703).

Almost surely, 2^31421745 is an apocalyptic number.

It is an amenable number.

31421745 is a deficient number, since it is larger than the sum of its proper divisors (23042691).

31421745 is a wasteful number, since it uses less digits than its factorization.

31421745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698272 (or 698269 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 31421745 is about 5605.5102354737. The cubic root of 31421745 is about 315.5562356486.

The spelling of 31421745 in words is "thirty-one million, four hundred twenty-one thousand, seven hundred forty-five".