31749923 has 2 divisors, whose sum is σ = 31749924. Its totient is φ = 31749922.

The previous prime is 31749919. The next prime is 31749937. The reversal of 31749923 is 32994713.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31749923 - 2² = 31749919 is a prime.

It is a super-2 number, since 2×31749923² = 2016115221011858, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (31742923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15874961 + 15874962.

It is an arithmetic number, because the mean of its divisors is an integer number (15874962).

Almost surely, 2^31749923 is an apocalyptic number.

31749923 is a deficient number, since it is larger than the sum of its proper divisors (1).

31749923 is an equidigital number, since it uses as much as digits as its factorization.

31749923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 38.

The square root of 31749923 is about 5634.7070021431. The cubic root of 31749923 is about 316.6510205874.

The spelling of 31749923 in words is "thirty-one million, seven hundred forty-nine thousand, nine hundred twenty-three".