2505420251 has 4 divisors (see below), whose sum is σ = 2566528104. Its totient is φ = 2444312400.

The previous prime is 2505420233. The next prime is 2505420259. The reversal of 2505420251 is 1520245052.

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

It is a cyclic number.

It is not a de Polignac number, because 2505420251 - 2¹⁰ = 2505419227 is a prime.

It is a super-3 number, since 3×2505420251³ (a number of 29 digits) contains 333 as substring.

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 2505420251.

It is not an unprimeable number, because it can be changed into a prime (2505420259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30553865 + ... + 30553946.

It is an arithmetic number, because the mean of its divisors is an integer number (641632026).

Almost surely, 2^2505420251 is an apocalyptic number.

2505420251 is a deficient number, since it is larger than the sum of its proper divisors (61107853).

2505420251 is an equidigital number, since it uses as much as digits as its factorization.

2505420251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61107852.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 2505420251 is about 50054.1731626844. The cubic root of 2505420251 is about 1358.1889552727.

The spelling of 2505420251 in words is "two billion, five hundred five million, four hundred twenty thousand, two hundred fifty-one".