157987789 has 2 divisors, whose sum is σ = 157987790. Its totient is φ = 157987788.

The previous prime is 157987769. The next prime is 157987813. The reversal of 157987789 is 987789751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111133764 + 46854025 = 10542^2 + 6845^2 .

It is a cyclic number.

It is not a de Polignac number, because 157987789 - 2²³ = 149599181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157987729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78993894 + 78993895.

It is an arithmetic number, because the mean of its divisors is an integer number (78993895).

Almost surely, 2^157987789 is an apocalyptic number.

It is an amenable number.

157987789 is a deficient number, since it is larger than the sum of its proper divisors (1).

157987789 is an equidigital number, since it uses as much as digits as its factorization.

157987789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8890560, while the sum is 61.

The square root of 157987789 is about 12569.3193530915. The cubic root of 157987789 is about 540.5980901838.

The spelling of 157987789 in words is "one hundred fifty-seven million, nine hundred eighty-seven thousand, seven hundred eighty-nine".