25152991 has 4 divisors (see below), whose sum is σ = 25176400. Its totient is φ = 25129584.

The previous prime is 25152983. The next prime is 25153001. The reversal of 25152991 is 19925152.

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 25152991 - 2³ = 25152983 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 (25152931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10011 + ... + 12268.

It is an arithmetic number, because the mean of its divisors is an integer number (6294100).

Almost surely, 2^25152991 is an apocalyptic number.

25152991 is a deficient number, since it is larger than the sum of its proper divisors (23409).

25152991 is a wasteful number, since it uses less digits than its factorization.

25152991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23408.

The product of its digits is 8100, while the sum is 34.

The square root of 25152991 is about 5015.2757651001. The cubic root of 25152991 is about 292.9970257554.

The spelling of 25152991 in words is "twenty-five million, one hundred fifty-two thousand, nine hundred ninety-one".