18860761 has 2 divisors, whose sum is σ = 18860762. Its totient is φ = 18860760.

The previous prime is 18860753. The next prime is 18860767. The reversal of 18860761 is 16706881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17065161 + 1795600 = 4131^2 + 1340^2 .

It is an emirp because it is prime and its reverse (16706881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18860761 - 2³ = 18860753 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18860761.

It is not a weakly prime, because it can be changed into another prime (18860767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9430380 + 9430381.

It is an arithmetic number, because the mean of its divisors is an integer number (9430381).

Almost surely, 2^18860761 is an apocalyptic number.

It is an amenable number.

18860761 is a deficient number, since it is larger than the sum of its proper divisors (1).

18860761 is an equidigital number, since it uses as much as digits as its factorization.

18860761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 18860761 is about 4342.8977653175. The cubic root of 18860761 is about 266.1867317176.

The spelling of 18860761 in words is "eighteen million, eight hundred sixty thousand, seven hundred sixty-one".