157158457 has 4 divisors (see below), whose sum is σ = 157404276. Its totient is φ = 156912640.

The previous prime is 157158433. The next prime is 157158467. The reversal of 157158457 is 754851751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 754851751 = 349 ⋅2162899.

It can be written as a sum of positive squares in 2 ways, for example, as 144456361 + 12702096 = 12019^2 + 3564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157158457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157158467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121948 + ... + 123229.

It is an arithmetic number, because the mean of its divisors is an integer number (39351069).

Almost surely, 2^157158457 is an apocalyptic number.

It is an amenable number.

157158457 is a deficient number, since it is larger than the sum of its proper divisors (245819).

157158457 is an equidigital number, since it uses as much as digits as its factorization.

157158457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245818.

The product of its digits is 196000, while the sum is 43.

The square root of 157158457 is about 12536.2856141682. The cubic root of 157158457 is about 539.6505020137.

The spelling of 157158457 in words is "one hundred fifty-seven million, one hundred fifty-eight thousand, four hundred fifty-seven".