7447906381 has 2 divisors, whose sum is σ = 7447906382. Its totient is φ = 7447906380.

The previous prime is 7447906343. The next prime is 7447906399. The reversal of 7447906381 is 1836097447.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7376233225 + 71673156 = 85885^2 + 8466^2 .

It is an emirp because it is prime and its reverse (1836097447) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7447906381 - 2⁹ = 7447905869 is a prime.

It is a super-2 number, since 2×7447906381² (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 (7447906481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3723953190 + 3723953191.

It is an arithmetic number, because the mean of its divisors is an integer number (3723953191).

Almost surely, 2^7447906381 is an apocalyptic number.

It is an amenable number.

7447906381 is a deficient number, since it is larger than the sum of its proper divisors (1).

7447906381 is an equidigital number, since it uses as much as digits as its factorization.

7447906381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1016064, while the sum is 49.

The square root of 7447906381 is about 86301.2536467461. The cubic root of 7447906381 is about 1952.8912954838.

The spelling of 7447906381 in words is "seven billion, four hundred forty-seven million, nine hundred six thousand, three hundred eighty-one".