31359749 has 2 divisors, whose sum is σ = 31359750. Its totient is φ = 31359748.

The previous prime is 31359721. The next prime is 31359767. The reversal of 31359749 is 94795313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21687649 + 9672100 = 4657^2 + 3110^2 .

It is a cyclic number.

It is not a de Polignac number, because 31359749 - 2¹⁶ = 31294213 is a prime.

It is a Chen prime.

It is equal to p_1936787 and since 31359749 and 1936787 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31359719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15679874 + 15679875.

It is an arithmetic number, because the mean of its divisors is an integer number (15679875).

Almost surely, 2^31359749 is an apocalyptic number.

It is an amenable number.

31359749 is a deficient number, since it is larger than the sum of its proper divisors (1).

31359749 is an equidigital number, since it uses as much as digits as its factorization.

31359749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102060, while the sum is 41.

The square root of 31359749 is about 5599.9775892409. The cubic root of 31359749 is about 315.3485651880.

The spelling of 31359749 in words is "thirty-one million, three hundred fifty-nine thousand, seven hundred forty-nine".