157009 has 4 divisors (see below), whose sum is σ = 158004. Its totient is φ = 156016.

The previous prime is 157007. The next prime is 157013. The reversal of 157009 is 900751.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 124609 + 32400 = 353^2 + 180^2 .

It is a cyclic number.

It is not a de Polignac number, because 157009 - 2¹ = 157007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157007) 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, 202 + ... + 595.

It is an arithmetic number, because the mean of its divisors is an integer number (39501).

2¹⁵⁷⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

157009 is a deficient number, since it is larger than the sum of its proper divisors (995).

157009 is an equidigital number, since it uses as much as digits as its factorization.

157009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994.

The product of its (nonzero) digits is 315, while the sum is 22.

The square root of 157009 is about 396.2436119359. The cubic root of 157009 is about 53.9479379340.

The spelling of 157009 in words is "one hundred fifty-seven thousand, nine".