2561633 has 2 divisors, whose sum is σ = 2561634. Its totient is φ = 2561632.

The previous prime is 2561627. The next prime is 2561651. The reversal of 2561633 is 3361652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2211169 + 350464 = 1487^2 + 592^2 .

It is a cyclic number.

It is not a de Polignac number, because 2561633 - 2¹⁶ = 2496097 is a prime.

It is not a weakly prime, because it can be changed into another prime (2561653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280816 + 1280817.

It is an arithmetic number, because the mean of its divisors is an integer number (1280817).

2^2561633 is an apocalyptic number.

It is an amenable number.

2561633 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561633 is an equidigital number, since it uses as much as digits as its factorization.

2561633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 26.

The square root of 2561633 is about 1600.5102311451. The cubic root of 2561633 is about 136.8271569548.

The spelling of 2561633 in words is "two million, five hundred sixty-one thousand, six hundred thirty-three".