7139717217 has 10 divisors (see below), whose sum is σ = 10665503618. Its totient is φ = 4759811424.

The previous prime is 7139717213. The next prime is 7139717251. The reversal of 7139717217 is 7127179317.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 4246998561 + 2892718656 = 65169^2 + 53784^2 .

It is not a de Polignac number, because 7139717217 - 2² = 7139717213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7139717213) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 44072248 + ... + 44072409.

Almost surely, 2^7139717217 is an apocalyptic number.

It is an amenable number.

7139717217 is a deficient number, since it is larger than the sum of its proper divisors (3525786401).

7139717217 is an equidigital number, since it uses as much as digits as its factorization.

7139717217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88144669 (or 88144660 counting only the distinct ones).

The product of its digits is 129654, while the sum is 45.

The square root of 7139717217 is about 84496.8473790591. The cubic root of 7139717217 is about 1925.5745486432.

The spelling of 7139717217 in words is "seven billion, one hundred thirty-nine million, seven hundred seventeen thousand, two hundred seventeen".