1922813649 has 12 divisors (see below), whose sum is σ = 2815444996. Its totient is φ = 1264315392.

The previous prime is 1922813597. The next prime is 1922813653. The reversal of 1922813649 is 9463182291.

1922813649 is a `hidden beast` number, since 1 + 9 + 2 + 281 + 364 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 957593025 + 965220624 = 30945^2 + 31068^2 .

It is not a de Polignac number, because 1922813649 - 2⁸ = 1922813393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1922818649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1462672 + ... + 1463985.

Almost surely, 2^1922813649 is an apocalyptic number.

It is an amenable number.

1922813649 is a deficient number, since it is larger than the sum of its proper divisors (892631347).

1922813649 is a wasteful number, since it uses less digits than its factorization.

1922813649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2926736 (or 2926733 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 1922813649 is about 43849.8990762807. The cubic root of 1922813649 is about 1243.4998353319.

The spelling of 1922813649 in words is "one billion, nine hundred twenty-two million, eight hundred thirteen thousand, six hundred forty-nine".