18949751 has 2 divisors, whose sum is σ = 18949752. Its totient is φ = 18949750.

The previous prime is 18949741. The next prime is 18949753. The reversal of 18949751 is 15794981.

It is a strong prime.

It is an emirp because it is prime and its reverse (15794981) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18949751 is a prime.

It is a Sophie Germain prime.

Together with 18949753, 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 (18949753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9474875 + 9474876.

It is an arithmetic number, because the mean of its divisors is an integer number (9474876).

Almost surely, 2^18949751 is an apocalyptic number.

18949751 is a deficient number, since it is larger than the sum of its proper divisors (1).

18949751 is an equidigital number, since it uses as much as digits as its factorization.

18949751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 44.

The square root of 18949751 is about 4353.1311719267. The cubic root of 18949751 is about 266.6047212017.

The spelling of 18949751 in words is "eighteen million, nine hundred forty-nine thousand, seven hundred fifty-one".