25120551 has 4 divisors (see below), whose sum is σ = 33494072. Its totient is φ = 16747032.

The previous prime is 25120549. The next prime is 25120553. The reversal of 25120551 is 15502152.

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

It is an interprime number because it is at equal distance from previous prime (25120549) and next prime (25120553).

It is not a de Polignac number, because 25120551 - 2¹ = 25120549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25120553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4186756 + ... + 4186761.

It is an arithmetic number, because the mean of its divisors is an integer number (8373518).

Almost surely, 2^25120551 is an apocalyptic number.

25120551 is a deficient number, since it is larger than the sum of its proper divisors (8373521).

25120551 is an equidigital number, since it uses as much as digits as its factorization.

25120551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8373520.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 25120551 is about 5012.0406023894. The cubic root of 25120551 is about 292.8710114165.

It can be divided in two parts, 251 and 20551, that added together give a palindrome (20802).

The spelling of 25120551 in words is "twenty-five million, one hundred twenty thousand, five hundred fifty-one".