25513131 has 16 divisors (see below), whose sum is σ = 39459584. Its totient is φ = 14360544.

The previous prime is 25513109. The next prime is 25513199. The reversal of 25513131 is 13131552.

It is not a de Polignac number, because 25513131 - 2¹⁰ = 25512107 is a prime.

It is a super-2 number, since 2×25513131² = 1301839706846322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25513098 and 25513107.

It is not an unprimeable number, because it can be changed into a prime (25513331) 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, 7660 + ... + 10473.

It is an arithmetic number, because the mean of its divisors is an integer number (2466224).

Almost surely, 2^25513131 is an apocalyptic number.

25513131 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

25513131 is a deficient number, since it is larger than the sum of its proper divisors (13946453).

25513131 is a wasteful number, since it uses less digits than its factorization.

25513131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18210.

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

The square root of 25513131 is about 5051.0524645860. The cubic root of 25513131 is about 294.3887794723.

Adding to 25513131 its reverse (13131552), we get a palindrome (38644683).

The spelling of 25513131 in words is "twenty-five million, five hundred thirteen thousand, one hundred thirty-one".