25213861 has 2 divisors, whose sum is σ = 25213862. Its totient is φ = 25213860.

The previous prime is 25213841. The next prime is 25213871. The reversal of 25213861 is 16831252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16769025 + 8444836 = 4095^2 + 2906^2 .

It is a cyclic number.

It is not a de Polignac number, because 25213861 - 2¹⁷ = 25082789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25213831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12606930 + 12606931.

It is an arithmetic number, because the mean of its divisors is an integer number (12606931).

Almost surely, 2^25213861 is an apocalyptic number.

It is an amenable number.

25213861 is a deficient number, since it is larger than the sum of its proper divisors (1).

25213861 is an equidigital number, since it uses as much as digits as its factorization.

25213861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 28.

The square root of 25213861 is about 5021.3405580582. The cubic root of 25213861 is about 293.2331853655.

The spelling of 25213861 in words is "twenty-five million, two hundred thirteen thousand, eight hundred sixty-one".