7081691905 has 4 divisors (see below), whose sum is σ = 8498030292. Its totient is φ = 5665353520.

The previous prime is 7081691899. The next prime is 7081691909. The reversal of 7081691905 is 5091961807.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5091961807 = 317 ⋅16062971.

It can be written as a sum of positive squares in 2 ways, for example, as 1730476801 + 5351215104 = 41599^2 + 73152^2 .

It is not a de Polignac number, because 7081691905 - 2⁷ = 7081691777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7081691909) 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, 708169186 + ... + 708169195.

It is an arithmetic number, because the mean of its divisors is an integer number (2124507573).

Almost surely, 2^7081691905 is an apocalyptic number.

It is an amenable number.

7081691905 is a deficient number, since it is larger than the sum of its proper divisors (1416338387).

7081691905 is a wasteful number, since it uses less digits than its factorization.

7081691905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1416338386.

The product of its (nonzero) digits is 136080, while the sum is 46.

The square root of 7081691905 is about 84152.7890506310. The cubic root of 7081691905 is about 1920.3438968237.

The spelling of 7081691905 in words is "seven billion, eighty-one million, six hundred ninety-one thousand, nine hundred five".