25122001 has 16 divisors (see below), whose sum is σ = 26725248. Its totient is φ = 23587200.

The previous prime is 25121969. The next prime is 25122011. The reversal of 25122001 is 10022152.

It is a cyclic number.

It is not a de Polignac number, because 25122001 - 2⁵ = 25121969 is a prime.

It is a super-2 number, since 2×25122001² = 1262229868488002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25122011) 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, 191706 + ... + 191836.

It is an arithmetic number, because the mean of its divisors is an integer number (1670328).

Almost surely, 2^25122001 is an apocalyptic number.

It is an amenable number.

25122001 is a deficient number, since it is larger than the sum of its proper divisors (1603247).

25122001 is a wasteful number, since it uses less digits than its factorization.

25122001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 25122001 is about 5012.1852519635. The cubic root of 25122001 is about 292.8766463088.

Adding to 25122001 its reverse (10022152), we get a palindrome (35144153).

The spelling of 25122001 in words is "twenty-five million, one hundred twenty-two thousand, one".