18730501 has 2 divisors, whose sum is σ = 18730502. Its totient is φ = 18730500.

The previous prime is 18730489. The next prime is 18730519. The reversal of 18730501 is 10503781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16008001 + 2722500 = 4001^2 + 1650^2 .

It is a cyclic number.

It is not a de Polignac number, because 18730501 - 2⁵ = 18730469 is a prime.

It is a super-2 number, since 2×18730501² = 701663335422002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18730531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9365250 + 9365251.

It is an arithmetic number, because the mean of its divisors is an integer number (9365251).

Almost surely, 2^18730501 is an apocalyptic number.

It is an amenable number.

18730501 is a deficient number, since it is larger than the sum of its proper divisors (1).

18730501 is an equidigital number, since it uses as much as digits as its factorization.

18730501 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 25.

The square root of 18730501 is about 4327.8748826647. The cubic root of 18730501 is about 265.5725180004.

The spelling of 18730501 in words is "eighteen million, seven hundred thirty thousand, five hundred one".