15891671 has 2 divisors, whose sum is σ = 15891672. Its totient is φ = 15891670.

The previous prime is 15891661. The next prime is 15891683. The reversal of 15891671 is 17619851.

It is a weak prime.

It is an emirp because it is prime and its reverse (17619851) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15891671 - 2¹⁸ = 15629527 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15891661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7945835 + 7945836.

It is an arithmetic number, because the mean of its divisors is an integer number (7945836).

Almost surely, 2^15891671 is an apocalyptic number.

15891671 is a deficient number, since it is larger than the sum of its proper divisors (1).

15891671 is an equidigital number, since it uses as much as digits as its factorization.

15891671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 38.

The square root of 15891671 is about 3986.4358768203. The cubic root of 15891671 is about 251.4142300612.

The spelling of 15891671 in words is "fifteen million, eight hundred ninety-one thousand, six hundred seventy-one".