15941381 has 2 divisors, whose sum is σ = 15941382. Its totient is φ = 15941380.

The previous prime is 15941363. The next prime is 15941383. The reversal of 15941381 is 18314951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14753281 + 1188100 = 3841^2 + 1090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15941381 is a prime.

It is a super-2 number, since 2×15941381² = 508255256374322, which contains 22 as substring.

Together with 15941383, 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 (15941383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7970690 + 7970691.

It is an arithmetic number, because the mean of its divisors is an integer number (7970691).

Almost surely, 2^15941381 is an apocalyptic number.

It is an amenable number.

15941381 is a deficient number, since it is larger than the sum of its proper divisors (1).

15941381 is an equidigital number, since it uses as much as digits as its factorization.

15941381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 32.

The square root of 15941381 is about 3992.6659013747. The cubic root of 15941381 is about 251.6761029360.

The spelling of 15941381 in words is "fifteen million, nine hundred forty-one thousand, three hundred eighty-one".