157196681 has 4 divisors (see below), whose sum is σ = 157555200. Its totient is φ = 156838164.

The previous prime is 157196657. The next prime is 157196687. The reversal of 157196681 is 186691751.

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.

It is a cyclic number.

It is not a de Polignac number, because 157196681 - 2¹⁰ = 157195657 is a prime.

It is a super-2 number, since 2×157196681² = 49421593034831522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (157196687) 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, 178601 + ... + 179478.

It is an arithmetic number, because the mean of its divisors is an integer number (39388800).

Almost surely, 2^157196681 is an apocalyptic number.

It is an amenable number.

157196681 is a deficient number, since it is larger than the sum of its proper divisors (358519).

157196681 is an equidigital number, since it uses as much as digits as its factorization.

157196681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358518.

The product of its digits is 90720, while the sum is 44.

The square root of 157196681 is about 12537.8100559867. The cubic root of 157196681 is about 539.6942496407.

The spelling of 157196681 in words is "one hundred fifty-seven million, one hundred ninety-six thousand, six hundred eighty-one".