1818349957 has 2 divisors, whose sum is σ = 1818349958. Its totient is φ = 1818349956.

The previous prime is 1818349943. The next prime is 1818349993. The reversal of 1818349957 is 7599438181.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 911677636 + 906672321 = 30194^2 + 30111^2 .

It is a cyclic number.

It is not a de Polignac number, because 1818349957 - 2⁷ = 1818349829 is a prime.

It is a super-2 number, since 2×1818349957² = 6612793132243803698, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1818349898 and 1818349907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1818349927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 909174978 + 909174979.

It is an arithmetic number, because the mean of its divisors is an integer number (909174979).

Almost surely, 2^1818349957 is an apocalyptic number.

It is an amenable number.

1818349957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1818349957 is an equidigital number, since it uses as much as digits as its factorization.

1818349957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 55.

The square root of 1818349957 is about 42642.1148279491. The cubic root of 1818349957 is about 1220.5600664642.

The spelling of 1818349957 in words is "one billion, eight hundred eighteen million, three hundred forty-nine thousand, nine hundred fifty-seven".