31340945 has 8 divisors (see below), whose sum is σ = 39821544. Its totient is φ = 23597824.

The previous prime is 31340929. The next prime is 31340971. The reversal of 31340945 is 54904313.

It can be written as a sum of positive squares in 4 ways, for example, as 2007889 + 29333056 = 1417^2 + 5416^2 .

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 31340945 - 2⁴ = 31340929 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184274 + ... + 184443.

It is an arithmetic number, because the mean of its divisors is an integer number (4977693).

Almost surely, 2^31340945 is an apocalyptic number.

It is an amenable number.

31340945 is a deficient number, since it is larger than the sum of its proper divisors (8480599).

31340945 is a wasteful number, since it uses less digits than its factorization.

31340945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368739.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 31340945 is about 5598.2984021933. The cubic root of 31340945 is about 315.2855225912.

The spelling of 31340945 in words is "thirty-one million, three hundred forty thousand, nine hundred forty-five".