157831613 has 4 divisors (see below), whose sum is σ = 166138560. Its totient is φ = 149524668.

The previous prime is 157831577. The next prime is 157831631. The reversal of 157831613 is 316138751.

157831613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 316138751 = 5261 ⋅60091.

It is a cyclic number.

It is not a de Polignac number, because 157831613 - 2⁸ = 157831357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157830613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4153445 + ... + 4153482.

It is an arithmetic number, because the mean of its divisors is an integer number (41534640).

Almost surely, 2^157831613 is an apocalyptic number.

It is an amenable number.

157831613 is a deficient number, since it is larger than the sum of its proper divisors (8306947).

157831613 is an equidigital number, since it uses as much as digits as its factorization.

157831613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8306946.

The product of its digits is 15120, while the sum is 35.

The square root of 157831613 is about 12563.1052292019. The cubic root of 157831613 is about 540.4198986007.

The spelling of 157831613 in words is "one hundred fifty-seven million, eight hundred thirty-one thousand, six hundred thirteen".