157969 has 4 divisors (see below), whose sum is σ = 180544. Its totient is φ = 135396.

The previous prime is 157951. The next prime is 157991. The reversal of 157969 is 969751.

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 157969 - 2⁷ = 157841 is a prime.

It is a super-2 number, since 2×157969² = 49908409922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (157999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11277 + ... + 11290.

It is an arithmetic number, because the mean of its divisors is an integer number (45136).

2¹⁵⁷⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

157969 is a deficient number, since it is larger than the sum of its proper divisors (22575).

157969 is an equidigital number, since it uses as much as digits as its factorization.

157969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22574.

The product of its digits is 17010, while the sum is 37.

The square root of 157969 is about 397.4531418922. The cubic root of 157969 is about 54.0576658780.

It can be divided in two parts, 1 and 57969, that added together give a triangular number (57970 = T₃₄₀).

The spelling of 157969 in words is "one hundred fifty-seven thousand, nine hundred sixty-nine".