18519497 has 2 divisors, whose sum is σ = 18519498. Its totient is φ = 18519496.

The previous prime is 18519469. The next prime is 18519559. The reversal of 18519497 is 79491581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16491721 + 2027776 = 4061^2 + 1424^2 .

It is a cyclic number.

It is not a de Polignac number, because 18519497 - 2¹⁸ = 18257353 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18519407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9259748 + 9259749.

It is an arithmetic number, because the mean of its divisors is an integer number (9259749).

Almost surely, 2^18519497 is an apocalyptic number.

It is an amenable number.

18519497 is a deficient number, since it is larger than the sum of its proper divisors (1).

18519497 is an equidigital number, since it uses as much as digits as its factorization.

18519497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 44.

The square root of 18519497 is about 4303.4285168921. The cubic root of 18519497 is about 264.5715016402.

The spelling of 18519497 in words is "eighteen million, five hundred nineteen thousand, four hundred ninety-seven".