7215993139 has 4 divisors (see below), whose sum is σ = 7257704256. Its totient is φ = 7174282024.

The previous prime is 7215993097. The next prime is 7215993167. The reversal of 7215993139 is 9313995127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9313995127 = 211 ⋅44142157.

It is a cyclic number.

It is not a de Polignac number, because 7215993139 - 2⁹ = 7215992627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7215993092 and 7215993101.

It is not an unprimeable number, because it can be changed into a prime (7215993199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20855299 + ... + 20855644.

It is an arithmetic number, because the mean of its divisors is an integer number (1814426064).

Almost surely, 2^7215993139 is an apocalyptic number.

7215993139 is a deficient number, since it is larger than the sum of its proper divisors (41711117).

7215993139 is a wasteful number, since it uses less digits than its factorization.

7215993139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41711116.

The product of its digits is 459270, while the sum is 49.

The square root of 7215993139 is about 84947.0019423876. The cubic root of 7215993139 is about 1932.4074531921.

The spelling of 7215993139 in words is "seven billion, two hundred fifteen million, nine hundred ninety-three thousand, one hundred thirty-nine".