18761513 has 2 divisors, whose sum is σ = 18761514. Its totient is φ = 18761512.

The previous prime is 18761461. The next prime is 18761539. The reversal of 18761513 is 31516781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18731584 + 29929 = 4328^2 + 173^2 .

It is an emirp because it is prime and its reverse (31516781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18761513 - 2¹⁶ = 18695977 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18761513.

It is not a weakly prime, because it can be changed into another prime (18761573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9380756 + 9380757.

It is an arithmetic number, because the mean of its divisors is an integer number (9380757).

Almost surely, 2^18761513 is an apocalyptic number.

It is an amenable number.

18761513 is a deficient number, since it is larger than the sum of its proper divisors (1).

18761513 is an equidigital number, since it uses as much as digits as its factorization.

18761513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 32.

The square root of 18761513 is about 4331.4562216419. The cubic root of 18761513 is about 265.7190062285.

The spelling of 18761513 in words is "eighteen million, seven hundred sixty-one thousand, five hundred thirteen".