1869813641 has 2 divisors, whose sum is σ = 1869813642. Its totient is φ = 1869813640.

The previous prime is 1869813593. The next prime is 1869813653. The reversal of 1869813641 is 1463189681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1011558025 + 858255616 = 31805^2 + 29296^2 .

It is a cyclic number.

It is not a de Polignac number, because 1869813641 - 2²² = 1865619337 is a prime.

It is not a weakly prime, because it can be changed into another prime (1869813661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 934906820 + 934906821.

It is an arithmetic number, because the mean of its divisors is an integer number (934906821).

Almost surely, 2^1869813641 is an apocalyptic number.

It is an amenable number.

1869813641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1869813641 is an equidigital number, since it uses as much as digits as its factorization.

1869813641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 47.

The square root of 1869813641 is about 43241.3418038802. The cubic root of 1869813641 is about 1231.9680396025.

The spelling of 1869813641 in words is "one billion, eight hundred sixty-nine million, eight hundred thirteen thousand, six hundred forty-one".