25771213 has 4 divisors (see below), whose sum is σ = 27753628. Its totient is φ = 23788800.

The previous prime is 25771183. The next prime is 25771223. The reversal of 25771213 is 31217752.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15389929 + 10381284 = 3923^2 + 3222^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25771213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25771223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 991188 + ... + 991213.

It is an arithmetic number, because the mean of its divisors is an integer number (6938407).

Almost surely, 2^25771213 is an apocalyptic number.

It is an amenable number.

25771213 is a deficient number, since it is larger than the sum of its proper divisors (1982415).

25771213 is a wasteful number, since it uses less digits than its factorization.

25771213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1982414.

The product of its digits is 2940, while the sum is 28.

The square root of 25771213 is about 5076.5355312457. The cubic root of 25771213 is about 295.3780960618.

Adding to 25771213 its reverse (31217752), we get a palindrome (56988965).

The spelling of 25771213 in words is "twenty-five million, seven hundred seventy-one thousand, two hundred thirteen".