159644491 has 2 divisors, whose sum is σ = 159644492. Its totient is φ = 159644490.

The previous prime is 159644483. The next prime is 159644497. The reversal of 159644491 is 194446951.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 159644491 - 2³ = 159644483 is a prime.

It is not a weakly prime, because it can be changed into another prime (159644497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79822245 + 79822246.

It is an arithmetic number, because the mean of its divisors is an integer number (79822246).

Almost surely, 2^159644491 is an apocalyptic number.

159644491 is a deficient number, since it is larger than the sum of its proper divisors (1).

159644491 is an equidigital number, since it uses as much as digits as its factorization.

159644491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 43.

The square root of 159644491 is about 12635.0500988322. The cubic root of 159644491 is about 542.4811418618.

The spelling of 159644491 in words is "one hundred fifty-nine million, six hundred forty-four thousand, four hundred ninety-one".