15861161 has 4 divisors (see below), whose sum is σ = 15875412. Its totient is φ = 15846912.

The previous prime is 15861121. The next prime is 15861163. The reversal of 15861161 is 16116851.

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 7595536 + 8265625 = 2756^2 + 2875^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15861161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15861163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5300 + ... + 7733.

It is an arithmetic number, because the mean of its divisors is an integer number (3968853).

Almost surely, 2^15861161 is an apocalyptic number.

It is an amenable number.

15861161 is a deficient number, since it is larger than the sum of its proper divisors (14251).

15861161 is a wasteful number, since it uses less digits than its factorization.

15861161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14250.

The product of its digits is 1440, while the sum is 29.

The square root of 15861161 is about 3982.6073117996. The cubic root of 15861161 is about 251.2532324692.

The spelling of 15861161 in words is "fifteen million, eight hundred sixty-one thousand, one hundred sixty-one".