25520099 has 16 divisors (see below), whose sum is σ = 29193216. Its totient is φ = 22096800.

The previous prime is 25520071. The next prime is 25520123. The reversal of 25520099 is 99002552.

It is not a de Polignac number, because 25520099 - 2¹² = 25516003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25520699) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22289 + ... + 23405.

It is an arithmetic number, because the mean of its divisors is an integer number (1824576).

Almost surely, 2^25520099 is an apocalyptic number.

25520099 is a deficient number, since it is larger than the sum of its proper divisors (3673117).

25520099 is a wasteful number, since it uses less digits than its factorization.

25520099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1226.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 25520099 is about 5051.7421747354. The cubic root of 25520099 is about 294.4155776244.

The spelling of 25520099 in words is "twenty-five million, five hundred twenty thousand, ninety-nine".