25116731 has 2 divisors, whose sum is σ = 25116732. Its totient is φ = 25116730.

The previous prime is 25116683. The next prime is 25116733. The reversal of 25116731 is 13761152.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25116731 is a prime.

It is a super-2 number, since 2×25116731² = 1261700352252722, which contains 22 as substring.

Together with 25116733, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25116731.

It is not a weakly prime, because it can be changed into another prime (25116733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12558365 + 12558366.

It is an arithmetic number, because the mean of its divisors is an integer number (12558366).

Almost surely, 2^25116731 is an apocalyptic number.

25116731 is a deficient number, since it is larger than the sum of its proper divisors (1).

25116731 is an equidigital number, since it uses as much as digits as its factorization.

25116731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1260, while the sum is 26.

The square root of 25116731 is about 5011.6595055929. The cubic root of 25116731 is about 292.8561653518.

Adding to 25116731 its reverse (13761152), we get a palindrome (38877883).

The spelling of 25116731 in words is "twenty-five million, one hundred sixteen thousand, seven hundred thirty-one".