15198991 has 2 divisors, whose sum is σ = 15198992. Its totient is φ = 15198990.

The previous prime is 15198973. The next prime is 15199007. The reversal of 15198991 is 19989151.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15198991 - 2¹¹ = 15196943 is a prime.

It is a super-3 number, since 3×15198991³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15199991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7599495 + 7599496.

It is an arithmetic number, because the mean of its divisors is an integer number (7599496).

Almost surely, 2^15198991 is an apocalyptic number.

15198991 is a deficient number, since it is larger than the sum of its proper divisors (1).

15198991 is an equidigital number, since it uses as much as digits as its factorization.

15198991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 43.

The square root of 15198991 is about 3898.5883342564. The cubic root of 15198991 is about 247.7069846232.

The spelling of 15198991 in words is "fifteen million, one hundred ninety-eight thousand, nine hundred ninety-one".