25531131 has 8 divisors (see below), whose sum is σ = 34069504. Its totient is φ = 17006760.

The previous prime is 25531111. The next prime is 25531139. The reversal of 25531131 is 13113552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25531131 - 2¹¹ = 25529083 is a prime.

It is a super-2 number, since 2×25531131² = 1303677300278322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25531098 and 25531107.

It is not an unprimeable number, because it can be changed into a prime (25531139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1986 + ... + 7416.

It is an arithmetic number, because the mean of its divisors is an integer number (4258688).

Almost surely, 2^25531131 is an apocalyptic number.

25531131 is a deficient number, since it is larger than the sum of its proper divisors (8538373).

25531131 is a wasteful number, since it uses less digits than its factorization.

25531131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7001.

The product of its digits is 450, while the sum is 21.

The square root of 25531131 is about 5052.8339572956. The cubic root of 25531131 is about 294.4579954946.

Adding to 25531131 its reverse (13113552), we get a palindrome (38644683).

The spelling of 25531131 in words is "twenty-five million, five hundred thirty-one thousand, one hundred thirty-one".