15395981 has 2 divisors, whose sum is σ = 15395982. Its totient is φ = 15395980.

The previous prime is 15395977. The next prime is 15395983. The reversal of 15395981 is 18959351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14891881 + 504100 = 3859^2 + 710^2 .

It is a cyclic number.

It is not a de Polignac number, because 15395981 - 2² = 15395977 is a prime.

It is a super-2 number, since 2×15395981² = 474072461904722, which contains 22 as substring.

Together with 15395983, 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 (15395983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7697990 + 7697991.

It is an arithmetic number, because the mean of its divisors is an integer number (7697991).

Almost surely, 2^15395981 is an apocalyptic number.

It is an amenable number.

15395981 is a deficient number, since it is larger than the sum of its proper divisors (1).

15395981 is an equidigital number, since it uses as much as digits as its factorization.

15395981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48600, while the sum is 41.

The square root of 15395981 is about 3923.7712726406. The cubic root of 15395981 is about 248.7725486491.

The spelling of 15395981 in words is "fifteen million, three hundred ninety-five thousand, nine hundred eighty-one".