18973151 has 2 divisors, whose sum is σ = 18973152. Its totient is φ = 18973150.

The previous prime is 18973093. The next prime is 18973159. The reversal of 18973151 is 15137981.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18973151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18973159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9486575 + 9486576.

It is an arithmetic number, because the mean of its divisors is an integer number (9486576).

Almost surely, 2^18973151 is an apocalyptic number.

18973151 is a deficient number, since it is larger than the sum of its proper divisors (1).

18973151 is an equidigital number, since it uses as much as digits as its factorization.

18973151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 35.

The square root of 18973151 is about 4355.8180632345. The cubic root of 18973151 is about 266.7144145403.

The spelling of 18973151 in words is "eighteen million, nine hundred seventy-three thousand, one hundred fifty-one".