7725881 has 2 divisors, whose sum is σ = 7725882. Its totient is φ = 7725880.

The previous prime is 7725877. The next prime is 7725911. The reversal of 7725881 is 1885277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7645225 + 80656 = 2765^2 + 284^2 .

It is an emirp because it is prime and its reverse (1885277) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7725881 - 2² = 7725877 is a prime.

It is a super-2 number, since 2×7725881² = 119378474452322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7725821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3862940 + 3862941.

It is an arithmetic number, because the mean of its divisors is an integer number (3862941).

Almost surely, 2^7725881 is an apocalyptic number.

It is an amenable number.

7725881 is a deficient number, since it is larger than the sum of its proper divisors (1).

7725881 is an equidigital number, since it uses as much as digits as its factorization.

7725881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31360, while the sum is 38.

The square root of 7725881 is about 2779.5469055226. The cubic root of 7725881 is about 197.6890759944.

The spelling of 7725881 in words is "seven million, seven hundred twenty-five thousand, eight hundred eighty-one".