7919357881 has 2 divisors, whose sum is σ = 7919357882. Its totient is φ = 7919357880.

The previous prime is 7919357837. The next prime is 7919357893. The reversal of 7919357881 is 1887539197.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6645510400 + 1273847481 = 81520^2 + 35691^2 .

It is a cyclic number.

It is not a de Polignac number, because 7919357881 - 2²³ = 7910969273 is a prime.

It is a super-2 number, since 2×7919357881² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7919307881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3959678940 + 3959678941.

It is an arithmetic number, because the mean of its divisors is an integer number (3959678941).

Almost surely, 2^7919357881 is an apocalyptic number.

It is an amenable number.

7919357881 is a deficient number, since it is larger than the sum of its proper divisors (1).

7919357881 is an equidigital number, since it uses as much as digits as its factorization.

7919357881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3810240, while the sum is 58.

The square root of 7919357881 is about 88990.7741341764. The cubic root of 7919357881 is about 1993.2571157204.

The spelling of 7919357881 in words is "seven billion, nine hundred nineteen million, three hundred fifty-seven thousand, eight hundred eighty-one".