15545961 has 6 divisors (see below), whose sum is σ = 22455290. Its totient is φ = 10363968.

The previous prime is 15545941. The next prime is 15545987. The reversal of 15545961 is 16954551.

15545961 is a `hidden beast` number, since 15 + 54 + 596 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10112400 + 5433561 = 3180^2 + 2331^2 .

It is not a de Polignac number, because 15545961 - 2⁹ = 15545449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15545921) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 863656 + ... + 863673.

Almost surely, 2^15545961 is an apocalyptic number.

It is an amenable number.

15545961 is a deficient number, since it is larger than the sum of its proper divisors (6909329).

15545961 is a wasteful number, since it uses less digits than its factorization.

15545961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1727335 (or 1727332 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The square root of 15545961 is about 3942.8366692015. The cubic root of 15545961 is about 249.5777458740.

The spelling of 15545961 in words is "fifteen million, five hundred forty-five thousand, nine hundred sixty-one".