31143157 has 2 divisors, whose sum is σ = 31143158. Its totient is φ = 31143156.

The previous prime is 31143113. The next prime is 31143193. The reversal of 31143157 is 75134113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21446161 + 9696996 = 4631^2 + 3114^2 .

It is a cyclic number.

It is not a de Polignac number, because 31143157 - 2⁷ = 31143029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31143197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15571578 + 15571579.

It is an arithmetic number, because the mean of its divisors is an integer number (15571579).

Almost surely, 2^31143157 is an apocalyptic number.

It is an amenable number.

31143157 is a deficient number, since it is larger than the sum of its proper divisors (1).

31143157 is an equidigital number, since it uses as much as digits as its factorization.

31143157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1260, while the sum is 25.

The square root of 31143157 is about 5580.6054331049. The cubic root of 31143157 is about 314.6208826057.

The spelling of 31143157 in words is "thirty-one million, one hundred forty-three thousand, one hundred fifty-seven".