31849157 has 2 divisors, whose sum is σ = 31849158. Its totient is φ = 31849156.

The previous prime is 31849141. The next prime is 31849219. The reversal of 31849157 is 75194813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31013761 + 835396 = 5569^2 + 914^2 .

It is a cyclic number.

It is not a de Polignac number, because 31849157 - 2⁴ = 31849141 is a prime.

It is a super-2 number, since 2×31849157² = 2028737603221298, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31849157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31849117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15924578 + 15924579.

It is an arithmetic number, because the mean of its divisors is an integer number (15924579).

Almost surely, 2^31849157 is an apocalyptic number.

It is an amenable number.

31849157 is a deficient number, since it is larger than the sum of its proper divisors (1).

31849157 is an equidigital number, since it uses as much as digits as its factorization.

31849157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 38.

The square root of 31849157 is about 5643.5057366853. The cubic root of 31849157 is about 316.9805737979.

The spelling of 31849157 in words is "thirty-one million, eight hundred forty-nine thousand, one hundred fifty-seven".