25691043 has 16 divisors (see below), whose sum is σ = 39948800. Its totient is φ = 14680008.

The previous prime is 25691041. The next prime is 25691047. The reversal of 25691043 is 34019652.

It is not a de Polignac number, because 25691043 - 2¹ = 25691041 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25691043.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25691041) 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, 11455 + ... + 13512.

It is an arithmetic number, because the mean of its divisors is an integer number (2496800).

Almost surely, 2^25691043 is an apocalyptic number.

25691043 is a deficient number, since it is larger than the sum of its proper divisors (14257757).

25691043 is an equidigital number, since it uses as much as digits as its factorization.

25691043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24991 (or 24977 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 25691043 is about 5068.6332477306. The cubic root of 25691043 is about 295.0714870322.

The spelling of 25691043 in words is "twenty-five million, six hundred ninety-one thousand, forty-three".