15968261 has 2 divisors, whose sum is σ = 15968262. Its totient is φ = 15968260.

The previous prime is 15968231. The next prime is 15968263. The reversal of 15968261 is 16286951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14025025 + 1943236 = 3745^2 + 1394^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15968261 is a prime.

Together with 15968263, 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 (15968263) 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 as a sum of consecutive naturals, namely, 7984130 + 7984131.

It is an arithmetic number, because the mean of its divisors is an integer number (7984131).

Almost surely, 2^15968261 is an apocalyptic number.

It is an amenable number.

15968261 is a deficient number, since it is larger than the sum of its proper divisors (1).

15968261 is an equidigital number, since it uses as much as digits as its factorization.

15968261 is an odious number, because the sum of its binary digits is odd.

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

The square root of 15968261 is about 3996.0306555381. The cubic root of 15968261 is about 251.8174803747.

The spelling of 15968261 in words is "fifteen million, nine hundred sixty-eight thousand, two hundred sixty-one".