159721545 has 64 divisors (see below), whose sum is σ = 286032384. Its totient is φ = 75694080.

The previous prime is 159721537. The next prime is 159721547. The reversal of 159721545 is 545127951.

It is not a de Polignac number, because 159721545 - 2³ = 159721537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (159721547) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 662625 + ... + 662865.

It is an arithmetic number, because the mean of its divisors is an integer number (4469256).

Almost surely, 2^159721545 is an apocalyptic number.

159721545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

159721545 is a deficient number, since it is larger than the sum of its proper divisors (126310839).

159721545 is a wasteful number, since it uses less digits than its factorization.

159721545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402.

The product of its digits is 63000, while the sum is 39.

The square root of 159721545 is about 12638.0989472309. The cubic root of 159721545 is about 542.5684057950.

The spelling of 159721545 in words is "one hundred fifty-nine million, seven hundred twenty-one thousand, five hundred forty-five".