1813180081 has 2 divisors, whose sum is σ = 1813180082. Its totient is φ = 1813180080.

The previous prime is 1813180073. The next prime is 1813180099. The reversal of 1813180081 is 1800813181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1700820081 + 112360000 = 41241^2 + 10600^2 .

It is a cyclic number.

It is not a de Polignac number, because 1813180081 - 2³ = 1813180073 is a prime.

It is a super-2 number, since 2×1813180081² = 6575244012270333122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1813190081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906590040 + 906590041.

It is an arithmetic number, because the mean of its divisors is an integer number (906590041).

Almost surely, 2^1813180081 is an apocalyptic number.

It is an amenable number.

1813180081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1813180081 is an equidigital number, since it uses as much as digits as its factorization.

1813180081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 31.

The square root of 1813180081 is about 42581.4523120102. The cubic root of 1813180081 is about 1219.4022156514.

The spelling of 1813180081 in words is "one billion, eight hundred thirteen million, one hundred eighty thousand, eighty-one".