1157531 has 2 divisors, whose sum is σ = 1157532. Its totient is φ = 1157530.

The previous prime is 1157503. The next prime is 1157539. The reversal of 1157531 is 1357511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1157531 - 2¹⁸ = 895387 is a prime.

It is a super-2 number, since 2×1157531² = 2679756031922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1157497 and 1157506.

It is not a weakly prime, because it can be changed into another prime (1157539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578765 + 578766.

It is an arithmetic number, because the mean of its divisors is an integer number (578766).

2^1157531 is an apocalyptic number.

1157531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1157531 is an equidigital number, since it uses as much as digits as its factorization.

1157531 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1157531 is about 1075.8861463928. The cubic root of 1157531 is about 104.9971578974.

The spelling of 1157531 in words is "one million, one hundred fifty-seven thousand, five hundred thirty-one".