15691427 has 2 divisors, whose sum is σ = 15691428. Its totient is φ = 15691426.

The previous prime is 15691411. The next prime is 15691439. The reversal of 15691427 is 72419651.

It is a strong prime.

It is an emirp because it is prime and its reverse (72419651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15691427 - 2⁴ = 15691411 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15691477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7845713 + 7845714.

It is an arithmetic number, because the mean of its divisors is an integer number (7845714).

Almost surely, 2^15691427 is an apocalyptic number.

15691427 is a deficient number, since it is larger than the sum of its proper divisors (1).

15691427 is an equidigital number, since it uses as much as digits as its factorization.

15691427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 35.

The square root of 15691427 is about 3961.2405885025. The cubic root of 15691427 is about 250.3537764660.

The spelling of 15691427 in words is "fifteen million, six hundred ninety-one thousand, four hundred twenty-seven".