1819718897 has 2 divisors, whose sum is σ = 1819718898. Its totient is φ = 1819718896.

The previous prime is 1819718869. The next prime is 1819718909. The reversal of 1819718897 is 7988179181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1257127936 + 562590961 = 35456^2 + 23719^2 .

It is a cyclic number.

It is not a de Polignac number, because 1819718897 - 2²⁸ = 1551283441 is a prime.

It is a super-2 number, since 2×1819718897² = 6622753728197793218, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1819748897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 909859448 + 909859449.

It is an arithmetic number, because the mean of its divisors is an integer number (909859449).

Almost surely, 2^1819718897 is an apocalyptic number.

It is an amenable number.

1819718897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1819718897 is an equidigital number, since it uses as much as digits as its factorization.

1819718897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2032128, while the sum is 59.

The square root of 1819718897 is about 42658.1633102036. The cubic root of 1819718897 is about 1220.8662881135.

The spelling of 1819718897 in words is "one billion, eight hundred nineteen million, seven hundred eighteen thousand, eight hundred ninety-seven".