6918091373 has 4 divisors (see below), whose sum is σ = 6918267708. Its totient is φ = 6917915040.

The previous prime is 6918091361. The next prime is 6918091379. The reversal of 6918091373 is 3731908196.

It is a happy number.

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 4053486889 + 2864604484 = 63667^2 + 53522^2 .

It is a cyclic number.

It is not a de Polignac number, because 6918091373 - 2¹⁸ = 6917829229 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6918091379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215 + ... + 117627.

It is an arithmetic number, because the mean of its divisors is an integer number (1729566927).

Almost surely, 2^6918091373 is an apocalyptic number.

It is an amenable number.

6918091373 is a deficient number, since it is larger than the sum of its proper divisors (176335).

6918091373 is a wasteful number, since it uses less digits than its factorization.

6918091373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176334.

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 6918091373 is about 83175.0646107353. The cubic root of 6918091373 is about 1905.4406728257.

The spelling of 6918091373 in words is "six billion, nine hundred eighteen million, ninety-one thousand, three hundred seventy-three".