25831047 has 16 divisors (see below), whose sum is σ = 39207168. Its totient is φ = 14974080.

The previous prime is 25831021. The next prime is 25831063. The reversal of 25831047 is 74013852.

It is not a de Polignac number, because 25831047 - 2¹² = 25826951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25831067) 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 15 ways as a sum of consecutive naturals, for example, 16258 + ... + 17775.

It is an arithmetic number, because the mean of its divisors is an integer number (2450448).

Almost surely, 2^25831047 is an apocalyptic number.

25831047 is a deficient number, since it is larger than the sum of its proper divisors (13376121).

25831047 is a wasteful number, since it uses less digits than its factorization.

25831047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34070.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 25831047 is about 5082.4253068786. The cubic root of 25831047 is about 295.6065162083.

Adding to 25831047 its reverse (74013852), we get a palindrome (99844899).

The spelling of 25831047 in words is "twenty-five million, eight hundred thirty-one thousand, forty-seven".