157356809 has 2 divisors, whose sum is σ = 157356810. Its totient is φ = 157356808.

The previous prime is 157356791. The next prime is 157356817. The reversal of 157356809 is 908653751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117072400 + 40284409 = 10820^2 + 6347^2 .

It is an emirp because it is prime and its reverse (908653751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 157356809 - 2⁸ = 157356553 is a prime.

It is a super-2 number, since 2×157356809² = 49522330677324962, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 157356809.

It is not a weakly prime, because it can be changed into another prime (157356839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78678404 + 78678405.

It is an arithmetic number, because the mean of its divisors is an integer number (78678405).

Almost surely, 2^157356809 is an apocalyptic number.

It is an amenable number.

157356809 is a deficient number, since it is larger than the sum of its proper divisors (1).

157356809 is an equidigital number, since it uses as much as digits as its factorization.

157356809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 44.

The square root of 157356809 is about 12544.1942347845. The cubic root of 157356809 is about 539.8774401783.

The spelling of 157356809 in words is "one hundred fifty-seven million, three hundred fifty-six thousand, eight hundred nine".