7213777993 has 4 divisors (see below), whose sum is σ = 7213956628. Its totient is φ = 7213599360.

The previous prime is 7213777979. The next prime is 7213778003. The reversal of 7213777993 is 3997773127.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3212962489 + 4000815504 = 56683^2 + 63252^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7213777993 is a prime.

It is a super-2 number, since 2×7213777993² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7213777913) 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, 3205 + ... + 120157.

It is an arithmetic number, because the mean of its divisors is an integer number (1803489157).

Almost surely, 2^7213777993 is an apocalyptic number.

It is an amenable number.

7213777993 is a deficient number, since it is larger than the sum of its proper divisors (178635).

7213777993 is a wasteful number, since it uses less digits than its factorization.

7213777993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178634.

The product of its digits is 3500658, while the sum is 55.

The square root of 7213777993 is about 84933.9625414946. The cubic root of 7213777993 is about 1932.2096978892.

The spelling of 7213777993 in words is "seven billion, two hundred thirteen million, seven hundred seventy-seven thousand, nine hundred ninety-three".