2561629 has 8 divisors (see below), whose sum is σ = 2963520. Its totient is φ = 2168736.

The previous prime is 2561627. The next prime is 2561633. The reversal of 2561629 is 9261652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2561629 - 2¹ = 2561627 is a prime.

2561629 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2561629.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1624 + ... + 2785.

It is an arithmetic number, because the mean of its divisors is an integer number (370440).

2^2561629 is an apocalyptic number.

It is an amenable number.

2561629 is a deficient number, since it is larger than the sum of its proper divisors (401891).

2561629 is an equidigital number, since it uses as much as digits as its factorization.

2561629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4499.

The product of its digits is 6480, while the sum is 31.

The square root of 2561629 is about 1600.5089815431. The cubic root of 2561629 is about 136.8270857361.

The spelling of 2561629 in words is "two million, five hundred sixty-one thousand, six hundred twenty-nine".