18949351 has 2 divisors, whose sum is σ = 18949352. Its totient is φ = 18949350.

The previous prime is 18949349. The next prime is 18949361. The reversal of 18949351 is 15394981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18949351 - 2¹ = 18949349 is a prime.

Together with 18949349, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18949321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9474675 + 9474676.

It is an arithmetic number, because the mean of its divisors is an integer number (9474676).

Almost surely, 2^18949351 is an apocalyptic number.

18949351 is a deficient number, since it is larger than the sum of its proper divisors (1).

18949351 is an equidigital number, since it uses as much as digits as its factorization.

18949351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 40.

The square root of 18949351 is about 4353.0852277437. The cubic root of 18949351 is about 266.6028453171.

The spelling of 18949351 in words is "eighteen million, nine hundred forty-nine thousand, three hundred fifty-one".