25231147 has 2 divisors, whose sum is σ = 25231148. Its totient is φ = 25231146.

The previous prime is 25231121. The next prime is 25231163. The reversal of 25231147 is 74113252.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25231147 - 2¹⁵ = 25198379 is a prime.

It is a super-2 number, since 2×25231147² = 1273221557871218, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25231187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12615573 + 12615574.

It is an arithmetic number, because the mean of its divisors is an integer number (12615574).

Almost surely, 2^25231147 is an apocalyptic number.

25231147 is a deficient number, since it is larger than the sum of its proper divisors (1).

25231147 is an equidigital number, since it uses as much as digits as its factorization.

25231147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 25.

The square root of 25231147 is about 5023.0615166450. The cubic root of 25231147 is about 293.3001811994.

Adding to 25231147 its reverse (74113252), we get a palindrome (99344399).

The spelling of 25231147 in words is "twenty-five million, two hundred thirty-one thousand, one hundred forty-seven".