18620051 has 2 divisors, whose sum is σ = 18620052. Its totient is φ = 18620050.

The previous prime is 18620047. The next prime is 18620089. The reversal of 18620051 is 15002681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18620051 - 2² = 18620047 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18619999 and 18620026.

It is not a weakly prime, because it can be changed into another prime (18620011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9310025 + 9310026.

It is an arithmetic number, because the mean of its divisors is an integer number (9310026).

Almost surely, 2^18620051 is an apocalyptic number.

18620051 is a deficient number, since it is larger than the sum of its proper divisors (1).

18620051 is an equidigital number, since it uses as much as digits as its factorization.

18620051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 18620051 is about 4315.0957115689. The cubic root of 18620051 is about 265.0494793096.

The spelling of 18620051 in words is "eighteen million, six hundred twenty thousand, fifty-one".