1812167249 has 2 divisors, whose sum is σ = 1812167250. Its totient is φ = 1812167248.

The previous prime is 1812167221. The next prime is 1812167299. The reversal of 1812167249 is 9427612181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1084516624 + 727650625 = 32932^2 + 26975^2 .

It is a cyclic number.

It is not a de Polignac number, because 1812167249 - 2²⁴ = 1795390033 is a prime.

It is not a weakly prime, because it can be changed into another prime (1812167209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906083624 + 906083625.

It is an arithmetic number, because the mean of its divisors is an integer number (906083625).

Almost surely, 2^1812167249 is an apocalyptic number.

It is an amenable number.

1812167249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1812167249 is an equidigital number, since it uses as much as digits as its factorization.

1812167249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 41.

The square root of 1812167249 is about 42569.5577731317. The cubic root of 1812167249 is about 1219.1751229993.

The spelling of 1812167249 in words is "one billion, eight hundred twelve million, one hundred sixty-seven thousand, two hundred forty-nine".