1815610361 has 2 divisors, whose sum is σ = 1815610362. Its totient is φ = 1815610360.

The previous prime is 1815610333. The next prime is 1815610397. The reversal of 1815610361 is 1630165181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1021441600 + 794168761 = 31960^2 + 28181^2 .

It is a cyclic number.

It is not a de Polignac number, because 1815610361 - 2⁶ = 1815610297 is a prime.

It is not a weakly prime, because it can be changed into another prime (1815610301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 907805180 + 907805181.

It is an arithmetic number, because the mean of its divisors is an integer number (907805181).

Almost surely, 2^1815610361 is an apocalyptic number.

It is an amenable number.

1815610361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1815610361 is an equidigital number, since it uses as much as digits as its factorization.

1815610361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 1815610361 is about 42609.9795939871. The cubic root of 1815610361 is about 1219.9467774417.

The spelling of 1815610361 in words is "one billion, eight hundred fifteen million, six hundred ten thousand, three hundred sixty-one".