157877509 has 2 divisors, whose sum is σ = 157877510. Its totient is φ = 157877508.

The previous prime is 157877507. The next prime is 157877549. The reversal of 157877509 is 905778751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99400900 + 58476609 = 9970^2 + 7647^2 .

It is a cyclic number.

It is not a de Polignac number, because 157877509 - 2¹ = 157877507 is a prime.

Together with 157877507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157877507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78938754 + 78938755.

It is an arithmetic number, because the mean of its divisors is an integer number (78938755).

Almost surely, 2^157877509 is an apocalyptic number.

It is an amenable number.

157877509 is a deficient number, since it is larger than the sum of its proper divisors (1).

157877509 is an equidigital number, since it uses as much as digits as its factorization.

157877509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 617400, while the sum is 49.

The square root of 157877509 is about 12564.9317148960. The cubic root of 157877509 is about 540.4722765906.

The spelling of 157877509 in words is "one hundred fifty-seven million, eight hundred seventy-seven thousand, five hundred nine".