2505551 has 8 divisors (see below), whose sum is σ = 2679264. Its totient is φ = 2337280.

The previous prime is 2505541. The next prime is 2505557. The reversal of 2505551 is 1555052.

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 2505551 - 2⁶ = 2505487 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2505557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 386 + ... + 2271.

It is an arithmetic number, because the mean of its divisors is an integer number (334908).

2^2505551 is an apocalyptic number.

2505551 is a deficient number, since it is larger than the sum of its proper divisors (173713).

2505551 is a wasteful number, since it uses less digits than its factorization.

2505551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2721.

The product of its (nonzero) digits is 1250, while the sum is 23.

The square root of 2505551 is about 1582.8932370820. The cubic root of 2505551 is about 135.8212581217.

The spelling of 2505551 in words is "two million, five hundred five thousand, five hundred fifty-one".