16413991 has 4 divisors (see below), whose sum is σ = 17906184. Its totient is φ = 14921800.

The previous prime is 16413961. The next prime is 16414037. The reversal of 16413991 is 19931461.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16413991 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 (16413931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 746080 + ... + 746101.

It is an arithmetic number, because the mean of its divisors is an integer number (4476546).

Almost surely, 2^16413991 is an apocalyptic number.

16413991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16413991 is a deficient number, since it is larger than the sum of its proper divisors (1492193).

16413991 is a wasteful number, since it uses less digits than its factorization.

16413991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1492192.

The product of its digits is 5832, while the sum is 34.

The square root of 16413991 is about 4051.4183936000. The cubic root of 16413991 is about 254.1390469793.

The spelling of 16413991 in words is "sixteen million, four hundred thirteen thousand, nine hundred ninety-one".