25481531 has 2 divisors, whose sum is σ = 25481532. Its totient is φ = 25481530.

The previous prime is 25481509. The next prime is 25481543. The reversal of 25481531 is 13518452.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25481531 is a prime.

It is a super-2 number, since 2×25481531² = 1298616844207922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25481494 and 25481503.

It is not a weakly prime, because it can be changed into another prime (25481231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12740765 + 12740766.

It is an arithmetic number, because the mean of its divisors is an integer number (12740766).

Almost surely, 2^25481531 is an apocalyptic number.

25481531 is the 2258-th centered decagonal number.

25481531 is a deficient number, since it is larger than the sum of its proper divisors (1).

25481531 is an equidigital number, since it uses as much as digits as its factorization.

25481531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4800, while the sum is 29.

The square root of 25481531 is about 5047.9234344431. The cubic root of 25481531 is about 294.2671881137.

Adding to 25481531 its reverse (13518452), we get a palindrome (38999983).

The spelling of 25481531 in words is "twenty-five million, four hundred eighty-one thousand, five hundred thirty-one".