31945145 has 8 divisors (see below), whose sum is σ = 38376960. Its totient is φ = 25527600.

The previous prime is 31945139. The next prime is 31945157. The reversal of 31945145 is 54154913.

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

It is not a de Polignac number, because 31945145 - 2⁸ = 31944889 is a prime.

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, 2216 + ... + 8294.

It is an arithmetic number, because the mean of its divisors is an integer number (4797120).

Almost surely, 2^31945145 is an apocalyptic number.

It is an amenable number.

31945145 is a deficient number, since it is larger than the sum of its proper divisors (6431815).

31945145 is a wasteful number, since it uses less digits than its factorization.

31945145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7135.

The product of its digits is 10800, while the sum is 32.

The square root of 31945145 is about 5652.0036270335. The cubic root of 31945145 is about 317.2986964594.

The spelling of 31945145 in words is "thirty-one million, nine hundred forty-five thousand, one hundred forty-five".