157378861 has 2 divisors, whose sum is σ = 157378862. Its totient is φ = 157378860.

The previous prime is 157378831. The next prime is 157378867. The reversal of 157378861 is 168873751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79762761 + 77616100 = 8931^2 + 8810^2 .

It is a cyclic number.

It is not a de Polignac number, because 157378861 - 2¹⁵ = 157346093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157378867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78689430 + 78689431.

It is an arithmetic number, because the mean of its divisors is an integer number (78689431).

Almost surely, 2^157378861 is an apocalyptic number.

It is an amenable number.

157378861 is a deficient number, since it is larger than the sum of its proper divisors (1).

157378861 is an equidigital number, since it uses as much as digits as its factorization.

157378861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 282240, while the sum is 46.

The square root of 157378861 is about 12545.0731763509. The cubic root of 157378861 is about 539.9026584943.

The spelling of 157378861 in words is "one hundred fifty-seven million, three hundred seventy-eight thousand, eight hundred sixty-one".