14861991 has 4 divisors (see below), whose sum is σ = 19815992. Its totient is φ = 9907992.

The previous prime is 14861983. The next prime is 14861993. The reversal of 14861991 is 19916841.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 14861991 - 2³ = 14861983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (14861993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2476996 + ... + 2477001.

It is an arithmetic number, because the mean of its divisors is an integer number (4953998).

Almost surely, 2^14861991 is an apocalyptic number.

14861991 is a deficient number, since it is larger than the sum of its proper divisors (4954001).

14861991 is an equidigital number, since it uses as much as digits as its factorization.

14861991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4954000.

The product of its digits is 15552, while the sum is 39.

The square root of 14861991 is about 3855.1252897928. The cubic root of 14861991 is about 245.8625215048.

The spelling of 14861991 in words is "fourteen million, eight hundred sixty-one thousand, nine hundred ninety-one".