15699091 has 2 divisors, whose sum is σ = 15699092. Its totient is φ = 15699090.

The previous prime is 15699053. The next prime is 15699097. The reversal of 15699091 is 19099651.

It is a strong prime.

It is an emirp because it is prime and its reverse (19099651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15699091 - 2¹⁷ = 15568019 is a prime.

It is a super-2 number, since 2×15699091² = 492922916452562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15699097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7849545 + 7849546.

It is an arithmetic number, because the mean of its divisors is an integer number (7849546).

Almost surely, 2^15699091 is an apocalyptic number.

15699091 is a deficient number, since it is larger than the sum of its proper divisors (1).

15699091 is an equidigital number, since it uses as much as digits as its factorization.

15699091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21870, while the sum is 40.

The square root of 15699091 is about 3962.2078441192. The cubic root of 15699091 is about 250.3945290598.

The spelling of 15699091 in words is "fifteen million, six hundred ninety-nine thousand, ninety-one".