7921774117 has 2 divisors, whose sum is σ = 7921774118. Its totient is φ = 7921774116.

The previous prime is 7921774061. The next prime is 7921774129. The reversal of 7921774117 is 7114771297.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7437510081 + 484264036 = 86241^2 + 22006^2 .

It is a cyclic number.

It is not a de Polignac number, because 7921774117 - 2³¹ = 5774290469 is a prime.

It is a super-2 number, since 2×7921774117² (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 (7921714117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3960887058 + 3960887059.

It is an arithmetic number, because the mean of its divisors is an integer number (3960887059).

Almost surely, 2^7921774117 is an apocalyptic number.

It is an amenable number.

7921774117 is a deficient number, since it is larger than the sum of its proper divisors (1).

7921774117 is an equidigital number, since it uses as much as digits as its factorization.

7921774117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172872, while the sum is 46.

The square root of 7921774117 is about 89004.3488656594. The cubic root of 7921774117 is about 1993.4598127043.

The spelling of 7921774117 in words is "seven billion, nine hundred twenty-one million, seven hundred seventy-four thousand, one hundred seventeen".