25513031 has 4 divisors (see below), whose sum is σ = 26336064. Its totient is φ = 24690000.

The previous prime is 25513013. The next prime is 25513043. The reversal of 25513031 is 13031552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25513031 - 2¹⁸ = 25250887 is a prime.

It is a super-2 number, since 2×25513031² = 1301829501613922, 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 = 25512994 and 25513012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25513001) 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 3 ways as a sum of consecutive naturals, for example, 411470 + ... + 411531.

It is an arithmetic number, because the mean of its divisors is an integer number (6584016).

Almost surely, 2^25513031 is an apocalyptic number.

25513031 is a deficient number, since it is larger than the sum of its proper divisors (823033).

25513031 is an equidigital number, since it uses as much as digits as its factorization.

25513031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823032.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 25513031 is about 5051.0425656492. The cubic root of 25513031 is about 294.3883948479.

Adding to 25513031 its reverse (13031552), we get a palindrome (38544583).

The spelling of 25513031 in words is "twenty-five million, five hundred thirteen thousand, thirty-one".