18271271497 has 2 divisors, whose sum is σ = 18271271498. Its totient is φ = 18271271496.

The previous prime is 18271271477. The next prime is 18271271503. The reversal of 18271271497 is 79417217281.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13923056016 + 4348215481 = 117996^2 + 65941^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18271271497 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18271271497.

It is not a weakly prime, because it can be changed into another prime (18271271477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9135635748 + 9135635749.

It is an arithmetic number, because the mean of its divisors is an integer number (9135635749).

Almost surely, 2^18271271497 is an apocalyptic number.

It is an amenable number.

18271271497 is a deficient number, since it is larger than the sum of its proper divisors (1).

18271271497 is an equidigital number, since it uses as much as digits as its factorization.

18271271497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 395136, while the sum is 49.

The spelling of 18271271497 in words is "eighteen billion, two hundred seventy-one million, two hundred seventy-one thousand, four hundred ninety-seven".