15970891 has 2 divisors, whose sum is σ = 15970892. Its totient is φ = 15970890.

The previous prime is 15970831. The next prime is 15970919. The reversal of 15970891 is 19807951.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15970891 - 2¹⁷ = 15839819 is a prime.

It is not a weakly prime, because it can be changed into another prime (15970831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7985445 + 7985446.

It is an arithmetic number, because the mean of its divisors is an integer number (7985446).

Almost surely, 2^15970891 is an apocalyptic number.

15970891 is a deficient number, since it is larger than the sum of its proper divisors (1).

15970891 is an equidigital number, since it uses as much as digits as its factorization.

15970891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 15970891 is about 3996.3597185439. The cubic root of 15970891 is about 251.8313045395.

It can be divided in two parts, 15970 and 891, that added together give a palindrome (16861).

The spelling of 15970891 in words is "fifteen million, nine hundred seventy thousand, eight hundred ninety-one".