16072991 has 4 divisors (see below), whose sum is σ = 17534184. Its totient is φ = 14611800.

The previous prime is 16072961. The next prime is 16072999. The reversal of 16072991 is 19927061.

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-16072991 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 (16072999) 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, 730580 + ... + 730601.

It is an arithmetic number, because the mean of its divisors is an integer number (4383546).

Almost surely, 2^16072991 is an apocalyptic number.

16072991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16072991 is a deficient number, since it is larger than the sum of its proper divisors (1461193).

16072991 is a wasteful number, since it uses less digits than its factorization.

16072991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1461192.

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 16072991 is about 4009.1134930306. The cubic root of 16072991 is about 252.3668075111.

The spelling of 16072991 in words is "sixteen million, seventy-two thousand, nine hundred ninety-one".