151649561 has 14 divisors (see below), whose sum is σ = 177061530. Its totient is φ = 129884496.

The previous prime is 151649521. The next prime is 151649573. The reversal of 151649561 is 165946151.

151649561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 144120025 + 7529536 = 12005^2 + 2744^2 .

It is not a de Polignac number, because 151649561 - 2¹⁸ = 151387417 is a prime.

It is a Duffinian number.

Its product of digits (32400) is a multiple of the sum of its prime divisors (1296).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (151649521) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 117005 + ... + 118293.

Almost surely, 2^151649561 is an apocalyptic number.

It is an amenable number.

151649561 is a deficient number, since it is larger than the sum of its proper divisors (25411969).

151649561 is an frugal number, since it uses more digits than its factorization.

151649561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331 (or 1296 counting only the distinct ones).

The product of its digits is 32400, while the sum is 38.

The square root of 151649561 is about 12314.6076267171. The cubic root of 151649561 is about 533.2698773027.

The spelling of 151649561 in words is "one hundred fifty-one million, six hundred forty-nine thousand, five hundred sixty-one".