18751013 has 2 divisors, whose sum is σ = 18751014. Its totient is φ = 18751012.

The previous prime is 18750989. The next prime is 18751087. The reversal of 18751013 is 31015781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16785409 + 1965604 = 4097^2 + 1402^2 .

It is an emirp because it is prime and its reverse (31015781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18751013 - 2⁸ = 18750757 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18751093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9375506 + 9375507.

It is an arithmetic number, because the mean of its divisors is an integer number (9375507).

Almost surely, 2^18751013 is an apocalyptic number.

It is an amenable number.

18751013 is a deficient number, since it is larger than the sum of its proper divisors (1).

18751013 is an equidigital number, since it uses as much as digits as its factorization.

18751013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 26.

The square root of 18751013 is about 4330.2439885069. The cubic root of 18751013 is about 265.6694265345.

Adding to 18751013 its reverse (31015781), we get a palindrome (49766794).

The spelling of 18751013 in words is "eighteen million, seven hundred fifty-one thousand, thirteen".