625551 has 8 divisors (see below), whose sum is σ = 842160. Its totient is φ = 412992.

The previous prime is 625543. The next prime is 625589. The reversal of 625551 is 155526.

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

It is not a de Polignac number, because 625551 - 2³ = 625543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 630 + ... + 1283.

It is an arithmetic number, because the mean of its divisors is an integer number (105270).

2⁶²⁵⁵⁵¹ is an apocalyptic number.

625551 is a deficient number, since it is larger than the sum of its proper divisors (216609).

625551 is a wasteful number, since it uses less digits than its factorization.

625551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2025.

The product of its digits is 1500, while the sum is 24.

The square root of 625551 is about 790.9178212684. The cubic root of 625551 is about 85.5239152006.

It can be divided in two parts, 625 and 551, that added together give a triangular number (1176 = T₄₈).

The spelling of 625551 in words is "six hundred twenty-five thousand, five hundred fifty-one".