15861361 has 4 divisors (see below), whose sum is σ = 15869952. Its totient is φ = 15852772.

The previous prime is 15861337. The next prime is 15861389. The reversal of 15861361 is 16316851.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16316851 = 1487 ⋅10973.

It is a cyclic number.

It is not a de Polignac number, because 15861361 - 2⁷ = 15861233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15861331) 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, 265 + ... + 5638.

It is an arithmetic number, because the mean of its divisors is an integer number (3967488).

Almost surely, 2^15861361 is an apocalyptic number.

It is an amenable number.

15861361 is a deficient number, since it is larger than the sum of its proper divisors (8591).

15861361 is an equidigital number, since it uses as much as digits as its factorization.

15861361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8590.

The product of its digits is 4320, while the sum is 31.

The square root of 15861361 is about 3982.6324208995. The cubic root of 15861361 is about 251.2542885170.

The spelling of 15861361 in words is "fifteen million, eight hundred sixty-one thousand, three hundred sixty-one".