25049991 has 4 divisors (see below), whose sum is σ = 33399992. Its totient is φ = 16699992.

The previous prime is 25049977. The next prime is 25050001. The reversal of 25049991 is 19994052.

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

It is not a de Polignac number, because 25049991 - 2⁷ = 25049863 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 (25049971) 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, 4174996 + ... + 4175001.

It is an arithmetic number, because the mean of its divisors is an integer number (8349998).

Almost surely, 2^25049991 is an apocalyptic number.

25049991 is a deficient number, since it is larger than the sum of its proper divisors (8350001).

25049991 is an equidigital number, since it uses as much as digits as its factorization.

25049991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8350000.

The product of its (nonzero) digits is 29160, while the sum is 39.

The square root of 25049991 is about 5004.9966033955. The cubic root of 25049991 is about 292.5965434835.

The spelling of 25049991 in words is "twenty-five million, forty-nine thousand, nine hundred ninety-one".