18742501 has 2 divisors, whose sum is σ = 18742502. Its totient is φ = 18742500.

The previous prime is 18742487. The next prime is 18742523. The reversal of 18742501 is 10524781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12744900 + 5997601 = 3570^2 + 2449^2 .

It is an emirp because it is prime and its reverse (10524781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18742501 - 2¹¹ = 18740453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18742501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18742541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9371250 + 9371251.

It is an arithmetic number, because the mean of its divisors is an integer number (9371251).

Almost surely, 2^18742501 is an apocalyptic number.

18742501 is the 2500-th hex number.

It is an amenable number.

18742501 is a deficient number, since it is larger than the sum of its proper divisors (1).

18742501 is an equidigital number, since it uses as much as digits as its factorization.

18742501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 18742501 is about 4329.2610223917. The cubic root of 18742501 is about 265.6292203436.

The spelling of 18742501 in words is "eighteen million, seven hundred forty-two thousand, five hundred one".