16290991 has 4 divisors (see below), whose sum is σ = 16487352. Its totient is φ = 16094632.

The previous prime is 16290979. The next prime is 16291007. The reversal of 16290991 is 19909261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19909261 = 17 ⋅1171133.

It is a cyclic number.

It is not a de Polignac number, because 16290991 - 2⁵ = 16290959 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16290991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16290941) 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, 98056 + ... + 98221.

It is an arithmetic number, because the mean of its divisors is an integer number (4121838).

Almost surely, 2^16290991 is an apocalyptic number.

16290991 is a deficient number, since it is larger than the sum of its proper divisors (196361).

16290991 is an equidigital number, since it uses as much as digits as its factorization.

16290991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196360.

The product of its (nonzero) digits is 8748, while the sum is 37.

The square root of 16290991 is about 4036.2099796715. The cubic root of 16290991 is about 253.5026486243.

The spelling of 16290991 in words is "sixteen million, two hundred ninety thousand, nine hundred ninety-one".