1531157 has 2 divisors, whose sum is σ = 1531158. Its totient is φ = 1531156.

The previous prime is 1531147. The next prime is 1531181. The reversal of 1531157 is 7511351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1378276 + 152881 = 1174^2 + 391^2 .

It is a cyclic number.

It is not a de Polignac number, because 1531157 - 2⁶ = 1531093 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 (1531147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 765578 + 765579.

It is an arithmetic number, because the mean of its divisors is an integer number (765579).

2^1531157 is an apocalyptic number.

It is an amenable number.

1531157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531157 is an equidigital number, since it uses as much as digits as its factorization.

1531157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 525, while the sum is 23.

The square root of 1531157 is about 1237.3992888312. The cubic root of 1531157 is about 115.2585738089.

The spelling of 1531157 in words is "one million, five hundred thirty-one thousand, one hundred fifty-seven".