15116861 has 2 divisors, whose sum is σ = 15116862. Its totient is φ = 15116860.

The previous prime is 15116851. The next prime is 15116863. The reversal of 15116861 is 16861151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9114361 + 6002500 = 3019^2 + 2450^2 .

It is a cyclic number.

It is not a de Polignac number, because 15116861 - 2²² = 10922557 is a prime.

Together with 15116863, 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 (15116863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7558430 + 7558431.

It is an arithmetic number, because the mean of its divisors is an integer number (7558431).

Almost surely, 2^15116861 is an apocalyptic number.

It is an amenable number.

15116861 is a deficient number, since it is larger than the sum of its proper divisors (1).

15116861 is an equidigital number, since it uses as much as digits as its factorization.

15116861 is an evil number, because the sum of its binary digits is even.

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

The square root of 15116861 is about 3888.0407662472. The cubic root of 15116861 is about 247.2600047479.

The spelling of 15116861 in words is "fifteen million, one hundred sixteen thousand, eight hundred sixty-one".