159780391 has 2 divisors, whose sum is σ = 159780392. Its totient is φ = 159780390.

The previous prime is 159780373. The next prime is 159780407. The reversal of 159780391 is 193087951.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 159780391 - 2⁵ = 159780359 is a prime.

It is a super-2 number, since 2×159780391² = 51059546696225762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (159780301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79890195 + 79890196.

It is an arithmetic number, because the mean of its divisors is an integer number (79890196).

Almost surely, 2^159780391 is an apocalyptic number.

159780391 is a deficient number, since it is larger than the sum of its proper divisors (1).

159780391 is an equidigital number, since it uses as much as digits as its factorization.

159780391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 43.

The square root of 159780391 is about 12640.4268519698. The cubic root of 159780391 is about 542.6350302030.

The spelling of 159780391 in words is "one hundred fifty-nine million, seven hundred eighty thousand, three hundred ninety-one".