2501729 has 4 divisors (see below), whose sum is σ = 2505876. Its totient is φ = 2497584.

The previous prime is 2501699. The next prime is 2501761. The reversal of 2501729 is 9271052.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2408704 + 93025 = 1552^2 + 305^2 .

It is a cyclic number.

It is not a de Polignac number, because 2501729 - 2¹² = 2497633 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2501698 and 2501707.

It is not an unprimeable number, because it can be changed into a prime (2501789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 974 + ... + 2439.

It is an arithmetic number, because the mean of its divisors is an integer number (626469).

2^2501729 is an apocalyptic number.

It is an amenable number.

2501729 is a deficient number, since it is larger than the sum of its proper divisors (4147).

2501729 is an equidigital number, since it uses as much as digits as its factorization.

2501729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4146.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 2501729 is about 1581.6854933899. The cubic root of 2501729 is about 135.7521618066.

The spelling of 2501729 in words is "two million, five hundred one thousand, seven hundred twenty-nine".