1812452261 has 2 divisors, whose sum is σ = 1812452262. Its totient is φ = 1812452260.

The previous prime is 1812452221. The next prime is 1812452281. The reversal of 1812452261 is 1622542181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1515544900 + 296907361 = 38930^2 + 17231^2 .

It is a cyclic number.

It is not a de Polignac number, because 1812452261 - 2⁶ = 1812452197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1812452221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906226130 + 906226131.

It is an arithmetic number, because the mean of its divisors is an integer number (906226131).

Almost surely, 2^1812452261 is an apocalyptic number.

It is an amenable number.

1812452261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1812452261 is an equidigital number, since it uses as much as digits as its factorization.

1812452261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7680, while the sum is 32.

The square root of 1812452261 is about 42572.9052450030. The cubic root of 1812452261 is about 1219.2390356661.

The spelling of 1812452261 in words is "one billion, eight hundred twelve million, four hundred fifty-two thousand, two hundred sixty-one".