157812971 has 4 divisors (see below), whose sum is σ = 162903744. Its totient is φ = 152722200.

The previous prime is 157812961. The next prime is 157812973. The reversal of 157812971 is 179218751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 179218751 = 443 ⋅404557.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157812971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157812973) 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, 2545340 + ... + 2545401.

It is an arithmetic number, because the mean of its divisors is an integer number (40725936).

Almost surely, 2^157812971 is an apocalyptic number.

157812971 is a deficient number, since it is larger than the sum of its proper divisors (5090773).

157812971 is an equidigital number, since it uses as much as digits as its factorization.

157812971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5090772.

The product of its digits is 35280, while the sum is 41.

The square root of 157812971 is about 12562.3632728878. The cubic root of 157812971 is about 540.3986208516.

The spelling of 157812971 in words is "one hundred fifty-seven million, eight hundred twelve thousand, nine hundred seventy-one".