15961087 has 4 divisors (see below), whose sum is σ = 16020256. Its totient is φ = 15901920.

The previous prime is 15961073. The next prime is 15961111. The reversal of 15961087 is 78016951.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15961087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15961037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29178 + ... + 29719.

It is an arithmetic number, because the mean of its divisors is an integer number (4005064).

Almost surely, 2^15961087 is an apocalyptic number.

15961087 is a deficient number, since it is larger than the sum of its proper divisors (59169).

15961087 is an equidigital number, since it uses as much as digits as its factorization.

15961087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59168.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 15961087 is about 3995.1329139342. The cubic root of 15961087 is about 251.7797636980.

The spelling of 15961087 in words is "fifteen million, nine hundred sixty-one thousand, eighty-seven".