31749057 has 32 divisors (see below), whose sum is σ = 49920000. Its totient is φ = 19887120.

The previous prime is 31749049. The next prime is 31749083. The reversal of 31749057 is 75094713.

It is a happy number.

It is not a de Polignac number, because 31749057 - 2³ = 31749049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31749857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 101932 + ... + 102242.

It is an arithmetic number, because the mean of its divisors is an integer number (1560000).

Almost surely, 2^31749057 is an apocalyptic number.

It is an amenable number.

31749057 is a deficient number, since it is larger than the sum of its proper divisors (18170943).

31749057 is a wasteful number, since it uses less digits than its factorization.

31749057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538 (or 532 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The square root of 31749057 is about 5634.6301564522. The cubic root of 31749057 is about 316.6481416064.

The spelling of 31749057 in words is "thirty-one million, seven hundred forty-nine thousand, fifty-seven".