25313531 has 2 divisors, whose sum is σ = 25313532. Its totient is φ = 25313530.

The previous prime is 25313521. The next prime is 25313539. The reversal of 25313531 is 13531352.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25313531 is a prime.

It is a super-2 number, since 2×25313531² = 1281549703375922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25313497 and 25313506.

It is not a weakly prime, because it can be changed into another prime (25313539) 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 as a sum of consecutive naturals, namely, 12656765 + 12656766.

It is an arithmetic number, because the mean of its divisors is an integer number (12656766).

Almost surely, 2^25313531 is an apocalyptic number.

25313531 is a deficient number, since it is larger than the sum of its proper divisors (1).

25313531 is an equidigital number, since it uses as much as digits as its factorization.

25313531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1350, while the sum is 23.

The square root of 25313531 is about 5031.2554099350. The cubic root of 25313531 is about 293.6190594321.

Adding to 25313531 its reverse (13531352), we get a palindrome (38844883).

The spelling of 25313531 in words is "twenty-five million, three hundred thirteen thousand, five hundred thirty-one".