2054899561 has 27 divisors (see below), whose sum is σ = 2453541573. Its totient is φ = 1718951520.

The previous prime is 2054899519. The next prime is 2054899589. The reversal of 2054899561 is 1659984502.

The square root of 2054899561 is 45331.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1334513961 + 720385600 = 36531^2 + 26840^2 .

It is not a de Polignac number, because 2054899561 - 2⁷ = 2054899433 is a prime.

It is a super-2 number, since 2×2054899561² = 8445224411595985442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2054899261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 6482175 + ... + 6482491.

Almost surely, 2^2054899561 is an apocalyptic number.

2054899561 is the 45331-st square number.

2054899561 is the 22666-th centered octagonal number.

It is an amenable number.

2054899561 is a deficient number, since it is larger than the sum of its proper divisors (398642012).

2054899561 is an equidigital number, since it uses as much as digits as its factorization.

2054899561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682 (or 341 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 49.

The cubic root of 2054899561 is about 1271.3453329958.

Multiplying 2054899561 by its sum of digits (49), we get a square (100690078489 = 317317²).

The spelling of 2054899561 in words is "two billion, fifty-four million, eight hundred ninety-nine thousand, five hundred sixty-one".