25131481 has 2 divisors, whose sum is σ = 25131482. Its totient is φ = 25131480.

The previous prime is 25131437. The next prime is 25131493. The reversal of 25131481 is 18413152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24010000 + 1121481 = 4900^2 + 1059^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25131481 is a prime.

It is a super-2 number, since 2×25131481² = 1263182674506722, which contains 22 as substring.

It is equal to p_1573702 and since 25131481 and 1573702 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (25131781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12565740 + 12565741.

It is an arithmetic number, because the mean of its divisors is an integer number (12565741).

Almost surely, 2^25131481 is an apocalyptic number.

It is an amenable number.

25131481 is a deficient number, since it is larger than the sum of its proper divisors (1).

25131481 is an equidigital number, since it uses as much as digits as its factorization.

25131481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 25.

The square root of 25131481 is about 5013.1308580567. The cubic root of 25131481 is about 292.9134815041.

The spelling of 25131481 in words is "twenty-five million, one hundred thirty-one thousand, four hundred eighty-one".