18651401 has 2 divisors, whose sum is σ = 18651402. Its totient is φ = 18651400.

The previous prime is 18651377. The next prime is 18651403. The reversal of 18651401 is 10415681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16801801 + 1849600 = 4099^2 + 1360^2 .

It is a cyclic number.

It is not a de Polignac number, because 18651401 - 2⁶ = 18651337 is a prime.

Together with 18651403, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18651403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9325700 + 9325701.

It is an arithmetic number, because the mean of its divisors is an integer number (9325701).

Almost surely, 2^18651401 is an apocalyptic number.

It is an amenable number.

18651401 is a deficient number, since it is larger than the sum of its proper divisors (1).

18651401 is an equidigital number, since it uses as much as digits as its factorization.

18651401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 18651401 is about 4318.7267799665. The cubic root of 18651401 is about 265.1981477561.

The spelling of 18651401 in words is "eighteen million, six hundred fifty-one thousand, four hundred one".