158657491 has 2 divisors, whose sum is σ = 158657492. Its totient is φ = 158657490.

The previous prime is 158657483. The next prime is 158657531. The reversal of 158657491 is 194756851.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 158657491 - 2³ = 158657483 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (158651491) 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, 79328745 + 79328746.

It is an arithmetic number, because the mean of its divisors is an integer number (79328746).

Almost surely, 2^158657491 is an apocalyptic number.

158657491 is a deficient number, since it is larger than the sum of its proper divisors (1).

158657491 is an equidigital number, since it uses as much as digits as its factorization.

158657491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 46.

The square root of 158657491 is about 12595.9315256951. The cubic root of 158657491 is about 541.3608691093.

The spelling of 158657491 in words is "one hundred fifty-eight million, six hundred fifty-seven thousand, four hundred ninety-one".