157697 has 4 divisors (see below), whose sum is σ = 162816. Its totient is φ = 152580.

The previous prime is 157679. The next prime is 157721. The reversal of 157697 is 796751.

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 a de Polignac number, because none of the positive numbers 2^k-157697 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2513 + ... + 2574.

It is an arithmetic number, because the mean of its divisors is an integer number (40704).

It is a Proth number, since it is equal to 77 ⋅ 2¹¹ + 1 and 77 < 2¹¹.

2¹⁵⁷⁶⁹⁷ is an apocalyptic number.

It is an amenable number.

157697 is a deficient number, since it is larger than the sum of its proper divisors (5119).

157697 is an equidigital number, since it uses as much as digits as its factorization.

157697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5118.

The product of its digits is 13230, while the sum is 35.

The square root of 157697 is about 397.1108157681. The cubic root of 157697 is about 54.0266215330.

The spelling of 157697 in words is "one hundred fifty-seven thousand, six hundred ninety-seven".