157011209 has 2 divisors, whose sum is σ = 157011210. Its totient is φ = 157011208.

The previous prime is 157011143. The next prime is 157011227. The reversal of 157011209 is 902110751.

157011209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98565184 + 58446025 = 9928^2 + 7645^2 .

It is a cyclic number.

It is not a de Polignac number, because 157011209 - 2²⁰ = 155962633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (157011109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78505604 + 78505605.

It is an arithmetic number, because the mean of its divisors is an integer number (78505605).

Almost surely, 2^157011209 is an apocalyptic number.

It is an amenable number.

157011209 is a deficient number, since it is larger than the sum of its proper divisors (1).

157011209 is an equidigital number, since it uses as much as digits as its factorization.

157011209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 630, while the sum is 26.

The square root of 157011209 is about 12530.4113659528. The cubic root of 157011209 is about 539.4819093530.

The spelling of 157011209 in words is "one hundred fifty-seven million, eleven thousand, two hundred nine".