15191989 has 8 divisors (see below), whose sum is σ = 15514880. Its totient is φ = 14871600.

The previous prime is 15191987. The next prime is 15191993. The reversal of 15191989 is 98919151.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15191989 - 2¹ = 15191987 is a prime.

It is a super-2 number, since 2×15191989² = 461593059552242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15191987) 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 in 7 ways as a sum of consecutive naturals, for example, 16072 + ... + 16990.

It is an arithmetic number, because the mean of its divisors is an integer number (1939360).

Almost surely, 2^15191989 is an apocalyptic number.

It is an amenable number.

15191989 is a deficient number, since it is larger than the sum of its proper divisors (322891).

15191989 is an equidigital number, since it uses as much as digits as its factorization.

15191989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1251.

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

The square root of 15191989 is about 3897.6902134469. The cubic root of 15191989 is about 247.6689401960.

The spelling of 15191989 in words is "fifteen million, one hundred ninety-one thousand, nine hundred eighty-nine".