157812681 has 8 divisors (see below), whose sum is σ = 226602880. Its totient is φ = 97115472.

The previous prime is 157812647. The next prime is 157812703. The reversal of 157812681 is 186218751.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 157812681 - 2⁷ = 157812553 is a prime.

It is a super-2 number, since 2×157812681² = 49809684568815522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 4046479 = 157812681 / (1 + 5 + 7 + 8 + 1 + 2 + 6 + 8 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157812181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2023201 + ... + 2023278.

It is an arithmetic number, because the mean of its divisors is an integer number (28325360).

Almost surely, 2^157812681 is an apocalyptic number.

It is an amenable number.

157812681 is a deficient number, since it is larger than the sum of its proper divisors (68790199).

157812681 is a wasteful number, since it uses less digits than its factorization.

157812681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4046495.

The product of its digits is 26880, while the sum is 39.

The square root of 157812681 is about 12562.3517304683. The cubic root of 157812681 is about 540.3982898359.

The spelling of 157812681 in words is "one hundred fifty-seven million, eight hundred twelve thousand, six hundred eighty-one".