151836561 has 12 divisors (see below), whose sum is σ = 219597300. Its totient is φ = 101096160.

The previous prime is 151836557. The next prime is 151836583. The reversal of 151836561 is 165638151.

151836561 is a `hidden beast` number, since 15 + 1 + 83 + 6 + 561 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 106193025 + 45643536 = 10305^2 + 6756^2 .

It is not a de Polignac number, because 151836561 - 2² = 151836557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (151836541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2886 + ... + 17663.

It is an arithmetic number, because the mean of its divisors is an integer number (18299775).

Almost surely, 2^151836561 is an apocalyptic number.

It is an amenable number.

151836561 is a deficient number, since it is larger than the sum of its proper divisors (67760739).

151836561 is a wasteful number, since it uses less digits than its factorization.

151836561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21376 (or 21373 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 151836561 is about 12322.1978964793. The cubic root of 151836561 is about 533.4889800494.

The spelling of 151836561 in words is "one hundred fifty-one million, eight hundred thirty-six thousand, five hundred sixty-one".