31149993 has 8 divisors (see below), whose sum is σ = 47466688. Its totient is φ = 17799984.

The previous prime is 31149991. The next prime is 31149997. The reversal of 31149993 is 39994113.

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

It is not a de Polignac number, because 31149993 - 2¹ = 31149991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31149991) 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, 741646 + ... + 741687.

It is an arithmetic number, because the mean of its divisors is an integer number (5933336).

Almost surely, 2^31149993 is an apocalyptic number.

It is an amenable number.

31149993 is a deficient number, since it is larger than the sum of its proper divisors (16316695).

31149993 is a wasteful number, since it uses less digits than its factorization.

31149993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1483343.

The product of its digits is 26244, while the sum is 39.

The square root of 31149993 is about 5581.2178778471. The cubic root of 31149993 is about 314.6439009422.

The spelling of 31149993 in words is "thirty-one million, one hundred forty-nine thousand, nine hundred ninety-three".