25213831 has 2 divisors, whose sum is σ = 25213832. Its totient is φ = 25213830.

The previous prime is 25213787. The next prime is 25213841. The reversal of 25213831 is 13831252.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25213831 is a prime.

It is a super-4 number, since 4×25213831⁴ (a number of 31 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 25213796 and 25213805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25213841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12606915 + 12606916.

It is an arithmetic number, because the mean of its divisors is an integer number (12606916).

Almost surely, 2^25213831 is an apocalyptic number.

25213831 is a deficient number, since it is larger than the sum of its proper divisors (1).

25213831 is an equidigital number, since it uses as much as digits as its factorization.

25213831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 25.

The square root of 25213831 is about 5021.3375708072. The cubic root of 25213831 is about 293.2330690671.

The spelling of 25213831 in words is "twenty-five million, two hundred thirteen thousand, eight hundred thirty-one".