7725499381 has 2 divisors, whose sum is σ = 7725499382. Its totient is φ = 7725499380.

The previous prime is 7725499357. The next prime is 7725499409. The reversal of 7725499381 is 1839945277.

It is a happy number.

7725499381 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7277796100 + 447703281 = 85310^2 + 21159^2 .

It is an emirp because it is prime and its reverse (1839945277) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7725499381 - 2¹¹ = 7725497333 is a prime.

It is a super-2 number, since 2×7725499381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7725499081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3862749690 + 3862749691.

It is an arithmetic number, because the mean of its divisors is an integer number (3862749691).

Almost surely, 2^7725499381 is an apocalyptic number.

It is an amenable number.

7725499381 is a deficient number, since it is larger than the sum of its proper divisors (1).

7725499381 is an equidigital number, since it uses as much as digits as its factorization.

7725499381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3810240, while the sum is 55.

The square root of 7725499381 is about 87894.8199895762. The cubic root of 7725499381 is about 1976.8582099782.

The spelling of 7725499381 in words is "seven billion, seven hundred twenty-five million, four hundred ninety-nine thousand, three hundred eighty-one".