157809697 has 4 divisors (see below), whose sum is σ = 161658756. Its totient is φ = 153960640.

The previous prime is 157809683. The next prime is 157809703. The reversal of 157809697 is 796908751.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8579041 + 149230656 = 2929^2 + 12216^2 .

It is a cyclic number.

It is not a de Polignac number, because 157809697 - 2⁷ = 157809569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157801697) 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, 1924468 + ... + 1924549.

It is an arithmetic number, because the mean of its divisors is an integer number (40414689).

Almost surely, 2^157809697 is an apocalyptic number.

It is an amenable number.

157809697 is a deficient number, since it is larger than the sum of its proper divisors (3849059).

157809697 is an equidigital number, since it uses as much as digits as its factorization.

157809697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3849058.

The product of its (nonzero) digits is 952560, while the sum is 52.

The square root of 157809697 is about 12562.2329623360. The cubic root of 157809697 is about 540.3948837753.

The spelling of 157809697 in words is "one hundred fifty-seven million, eight hundred nine thousand, six hundred ninety-seven".