31045391 has 8 divisors (see below), whose sum is σ = 33586560. Its totient is φ = 28526112.

The previous prime is 31045351. The next prime is 31045409. The reversal of 31045391 is 19354013.

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 31045391 - 2²² = 26851087 is a prime.

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 31045391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31045351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2456 + ... + 8253.

It is an arithmetic number, because the mean of its divisors is an integer number (4198320).

Almost surely, 2^31045391 is an apocalyptic number.

31045391 is a deficient number, since it is larger than the sum of its proper divisors (2541169).

31045391 is a wasteful number, since it uses less digits than its factorization.

31045391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10945.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 31045391 is about 5571.8391039225. The cubic root of 31045391 is about 314.2913134874.

The spelling of 31045391 in words is "thirty-one million, forty-five thousand, three hundred ninety-one".