31149947 has 8 divisors (see below), whose sum is σ = 32458752. Its totient is φ = 29860200.

The previous prime is 31149929. The next prime is 31149959. The reversal of 31149947 is 74994113.

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 31149947 - 2¹⁶ = 31084411 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 31149947.

It is not an unprimeable number, because it can be changed into a prime (31149907) 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, 1379 + ... + 8012.

It is an arithmetic number, because the mean of its divisors is an integer number (4057344).

Almost surely, 2^31149947 is an apocalyptic number.

31149947 is a deficient number, since it is larger than the sum of its proper divisors (1308805).

31149947 is a wasteful number, since it uses less digits than its factorization.

31149947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9529.

The product of its digits is 27216, while the sum is 38.

The square root of 31149947 is about 5581.2137568812. The cubic root of 31149947 is about 314.6437460612.

The spelling of 31149947 in words is "thirty-one million, one hundred forty-nine thousand, nine hundred forty-seven".