1817622641 has 2 divisors, whose sum is σ = 1817622642. Its totient is φ = 1817622640.

The previous prime is 1817622629. The next prime is 1817622671. The reversal of 1817622641 is 1462267181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1121982016 + 695640625 = 33496^2 + 26375^2 .

It is an emirp because it is prime and its reverse (1462267181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1817622641 - 2⁶ = 1817622577 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1817622595 and 1817622604.

It is not a weakly prime, because it can be changed into another prime (1817622671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 908811320 + 908811321.

It is an arithmetic number, because the mean of its divisors is an integer number (908811321).

Almost surely, 2^1817622641 is an apocalyptic number.

It is an amenable number.

1817622641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1817622641 is an equidigital number, since it uses as much as digits as its factorization.

1817622641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 38.

The square root of 1817622641 is about 42633.5858332372. The cubic root of 1817622641 is about 1220.3973087859.

The spelling of 1817622641 in words is "one billion, eight hundred seventeen million, six hundred twenty-two thousand, six hundred forty-one".