31303157 has 2 divisors, whose sum is σ = 31303158. Its totient is φ = 31303156.

The previous prime is 31303133. The next prime is 31303163. The reversal of 31303157 is 75130313.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28633201 + 2669956 = 5351^2 + 1634^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31303157 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31303177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15651578 + 15651579.

It is an arithmetic number, because the mean of its divisors is an integer number (15651579).

Almost surely, 2^31303157 is an apocalyptic number.

It is an amenable number.

31303157 is a deficient number, since it is larger than the sum of its proper divisors (1).

31303157 is an equidigital number, since it uses as much as digits as its factorization.

31303157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 945, while the sum is 23.

The square root of 31303157 is about 5594.9224302040. The cubic root of 31303157 is about 315.1587576324.

The spelling of 31303157 in words is "thirty-one million, three hundred three thousand, one hundred fifty-seven".