15940091 has 2 divisors, whose sum is σ = 15940092. Its totient is φ = 15940090.

The previous prime is 15940073. The next prime is 15940109. The reversal of 15940091 is 19004951.

Together with next prime (15940109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (15940073) and next prime (15940109).

It is a cyclic number.

It is not a de Polignac number, because 15940091 - 2⁶ = 15940027 is a prime.

It is not a weakly prime, because it can be changed into another prime (15940591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7970045 + 7970046.

It is an arithmetic number, because the mean of its divisors is an integer number (7970046).

Almost surely, 2^15940091 is an apocalyptic number.

15940091 is a deficient number, since it is larger than the sum of its proper divisors (1).

15940091 is an equidigital number, since it uses as much as digits as its factorization.

15940091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 15940091 is about 3992.5043519075. The cubic root of 15940091 is about 251.6693140861.

The spelling of 15940091 in words is "fifteen million, nine hundred forty thousand, ninety-one".