25131439 has 6 divisors (see below), whose sum is σ = 25402704. Its totient is φ = 24863040.

The previous prime is 25131437. The next prime is 25131481. The reversal of 25131439 is 93413152.

It is not a de Polignac number, because 25131439 - 2¹ = 25131437 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 (25131437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8074 + ... + 10744.

It is an arithmetic number, because the mean of its divisors is an integer number (4233784).

Almost surely, 2^25131439 is an apocalyptic number.

25131439 is a deficient number, since it is larger than the sum of its proper divisors (271265).

25131439 is an frugal number, since it uses more digits than its factorization.

25131439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2865 (or 2768 counting only the distinct ones).

The product of its digits is 3240, while the sum is 28.

The square root of 25131439 is about 5013.1266690559. The cubic root of 25131439 is about 292.9133183306.

It can be divided in two parts, 2513143 and 9, that added together give a palindrome (2513152).

The spelling of 25131439 in words is "twenty-five million, one hundred thirty-one thousand, four hundred thirty-nine".