18097951 has 4 divisors (see below), whose sum is σ = 18111304. Its totient is φ = 18084600.

The previous prime is 18097931. The next prime is 18097991. The reversal of 18097951 is 15979081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15979081 = 2731 ⋅5851.

It is a cyclic number.

It is not a de Polignac number, because 18097951 - 2⁹ = 18097439 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 (18097931) 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, 4380 + ... + 7441.

It is an arithmetic number, because the mean of its divisors is an integer number (4527826).

Almost surely, 2^18097951 is an apocalyptic number.

18097951 is a deficient number, since it is larger than the sum of its proper divisors (13353).

18097951 is a wasteful number, since it uses less digits than its factorization.

18097951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13352.

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 18097951 is about 4254.1686614426. The cubic root of 18097951 is about 262.5486579490.

The spelling of 18097951 in words is "eighteen million, ninety-seven thousand, nine hundred fifty-one".