25691071 has 16 divisors (see below), whose sum is σ = 30551040. Its totient is φ = 21137760.

The previous prime is 25691047. The next prime is 25691077. The reversal of 25691071 is 17019652.

It is not a de Polignac number, because 25691071 - 2²¹ = 23593919 is a prime.

It is a super-2 number, since 2×25691071² = 1320062258254082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25691077) 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, 54780 + ... + 55246.

It is an arithmetic number, because the mean of its divisors is an integer number (1909440).

Almost surely, 2^25691071 is an apocalyptic number.

25691071 is a deficient number, since it is larger than the sum of its proper divisors (4859969).

25691071 is a wasteful number, since it uses less digits than its factorization.

25691071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 25691071 is about 5068.6360098157. The cubic root of 25691071 is about 295.0715942291.

The spelling of 25691071 in words is "twenty-five million, six hundred ninety-one thousand, seventy-one".