2509725621 has 16 divisors (see below), whose sum is σ = 3719959040. Its totient is φ = 1494624960.

The previous prime is 2509725611. The next prime is 2509725671. The reversal of 2509725621 is 1265279052.

It is not a de Polignac number, because 2509725621 - 2¹⁸ = 2509463477 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2509725621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2509725611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1036726 + ... + 1039143.

It is an arithmetic number, because the mean of its divisors is an integer number (232497440).

Almost surely, 2^2509725621 is an apocalyptic number.

It is an amenable number.

2509725621 is a deficient number, since it is larger than the sum of its proper divisors (1210233419).

2509725621 is a wasteful number, since it uses less digits than its factorization.

2509725621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2075916.

The product of its (nonzero) digits is 75600, while the sum is 39.

The square root of 2509725621 is about 50097.1618058349. The cubic root of 2509725621 is about 1358.9664907885.

The spelling of 2509725621 in words is "two billion, five hundred nine million, seven hundred twenty-five thousand, six hundred twenty-one".