31241657 has 2 divisors, whose sum is σ = 31241658. Its totient is φ = 31241656.

The previous prime is 31241641. The next prime is 31241677. The reversal of 31241657 is 75614213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24810361 + 6431296 = 4981^2 + 2536^2 .

It is an emirp because it is prime and its reverse (75614213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31241657 - 2⁴ = 31241641 is a prime.

It is a super-2 number, since 2×31241657² = 1952082264211298, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31241627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15620828 + 15620829.

It is an arithmetic number, because the mean of its divisors is an integer number (15620829).

Almost surely, 2^31241657 is an apocalyptic number.

It is an amenable number.

31241657 is a deficient number, since it is larger than the sum of its proper divisors (1).

31241657 is an equidigital number, since it uses as much as digits as its factorization.

31241657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 29.

The square root of 31241657 is about 5589.4236733316. The cubic root of 31241657 is about 314.9522292553.

The spelling of 31241657 in words is "thirty-one million, two hundred forty-one thousand, six hundred fifty-seven".