15926861 has 2 divisors, whose sum is σ = 15926862. Its totient is φ = 15926860.

The previous prime is 15926857. The next prime is 15926863. The reversal of 15926861 is 16862951.

15926861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10118761 + 5808100 = 3181^2 + 2410^2 .

It is a cyclic number.

It is not a de Polignac number, because 15926861 - 2² = 15926857 is a prime.

Together with 15926863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15926863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7963430 + 7963431.

It is an arithmetic number, because the mean of its divisors is an integer number (7963431).

Almost surely, 2^15926861 is an apocalyptic number.

It is an amenable number.

15926861 is a deficient number, since it is larger than the sum of its proper divisors (1).

15926861 is an equidigital number, since it uses as much as digits as its factorization.

15926861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 38.

The square root of 15926861 is about 3990.8471531744. The cubic root of 15926861 is about 251.5996677539.

The spelling of 15926861 in words is "fifteen million, nine hundred twenty-six thousand, eight hundred sixty-one".