7949185381 has 2 divisors, whose sum is σ = 7949185382. Its totient is φ = 7949185380.

The previous prime is 7949185357. The next prime is 7949185393. The reversal of 7949185381 is 1835819497.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7945048225 + 4137156 = 89135^2 + 2034^2 .

It is a cyclic number.

It is not a de Polignac number, because 7949185381 - 2³¹ = 5801701733 is a prime.

It is a super-2 number, since 2×7949185381² (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 (7949185301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3974592690 + 3974592691.

It is an arithmetic number, because the mean of its divisors is an integer number (3974592691).

Almost surely, 2^7949185381 is an apocalyptic number.

It is an amenable number.

7949185381 is a deficient number, since it is larger than the sum of its proper divisors (1).

7949185381 is an equidigital number, since it uses as much as digits as its factorization.

7949185381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 55.

The square root of 7949185381 is about 89158.2042270929. The cubic root of 7949185381 is about 1995.7564509304.

The spelling of 7949185381 in words is "seven billion, nine hundred forty-nine million, one hundred eighty-five thousand, three hundred eighty-one".