25315391 has 4 divisors (see below), whose sum is σ = 26647800. Its totient is φ = 23982984.

The previous prime is 25315373. The next prime is 25315403. The reversal of 25315391 is 19351352.

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 25315391 - 2¹⁸ = 25053247 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 (25315361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666176 + ... + 666213.

It is an arithmetic number, because the mean of its divisors is an integer number (6661950).

Almost surely, 2^25315391 is an apocalyptic number.

25315391 is a deficient number, since it is larger than the sum of its proper divisors (1332409).

25315391 is a wasteful number, since it uses less digits than its factorization.

25315391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332408.

The product of its digits is 4050, while the sum is 29.

The square root of 25315391 is about 5031.4402510613. The cubic root of 25315391 is about 293.6262508175.

The spelling of 25315391 in words is "twenty-five million, three hundred fifteen thousand, three hundred ninety-one".