157038209 has 2 divisors, whose sum is σ = 157038210. Its totient is φ = 157038208.

The previous prime is 157038191. The next prime is 157038253. The reversal of 157038209 is 902830751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137545984 + 19492225 = 11728^2 + 4415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157038209 is a prime.

It is not a weakly prime, because it can be changed into another prime (157038269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78519104 + 78519105.

It is an arithmetic number, because the mean of its divisors is an integer number (78519105).

Almost surely, 2^157038209 is an apocalyptic number.

It is an amenable number.

157038209 is a deficient number, since it is larger than the sum of its proper divisors (1).

157038209 is an equidigital number, since it uses as much as digits as its factorization.

157038209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 157038209 is about 12531.4886984747. The cubic root of 157038209 is about 539.5128310874.

The spelling of 157038209 in words is "one hundred fifty-seven million, thirty-eight thousand, two hundred nine".