157268209 has 4 divisors (see below), whose sum is σ = 179735104. Its totient is φ = 134801316.

The previous prime is 157268203. The next prime is 157268249. The reversal of 157268209 is 902862751.

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 157268209 - 2⁷ = 157268081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157268203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11233437 + ... + 11233450.

It is an arithmetic number, because the mean of its divisors is an integer number (44933776).

Almost surely, 2^157268209 is an apocalyptic number.

It is an amenable number.

157268209 is a deficient number, since it is larger than the sum of its proper divisors (22466895).

157268209 is an equidigital number, since it uses as much as digits as its factorization.

157268209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22466894.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 157268209 is about 12540.6622233437. The cubic root of 157268209 is about 539.7760948731.

The spelling of 157268209 in words is "one hundred fifty-seven million, two hundred sixty-eight thousand, two hundred nine".