159657749 has 4 divisors (see below), whose sum is σ = 160056300. Its totient is φ = 159259200.

The previous prime is 159657713. The next prime is 159657769. The reversal of 159657749 is 947756951.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 111978724 + 47679025 = 10582^2 + 6905^2 .

It is a cyclic number.

It is not a de Polignac number, because 159657749 - 2²⁴ = 142880533 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 159657749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159657769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198674 + ... + 199475.

It is an arithmetic number, because the mean of its divisors is an integer number (40014075).

Almost surely, 2^159657749 is an apocalyptic number.

It is an amenable number.

159657749 is a deficient number, since it is larger than the sum of its proper divisors (398551).

159657749 is an equidigital number, since it uses as much as digits as its factorization.

159657749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398550.

The product of its digits is 2381400, while the sum is 53.

The square root of 159657749 is about 12635.5747395993. The cubic root of 159657749 is about 542.4961585944.

The spelling of 159657749 in words is "one hundred fifty-nine million, six hundred fifty-seven thousand, seven hundred forty-nine".