80191613 has 4 divisors (see below), whose sum is σ = 82147548. Its totient is φ = 78235680.

The previous prime is 80191591. The next prime is 80191619. The reversal of 80191613 is 31619108.

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 25623844 + 54567769 = 5062^2 + 7387^2 .

It is a cyclic number.

It is not a de Polignac number, because 80191613 - 2⁸ = 80191357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80191619) 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, 977906 + ... + 977987.

It is an arithmetic number, because the mean of its divisors is an integer number (20536887).

Almost surely, 2^80191613 is an apocalyptic number.

It is an amenable number.

80191613 is a deficient number, since it is larger than the sum of its proper divisors (1955935).

80191613 is a wasteful number, since it uses less digits than its factorization.

80191613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1955934.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 80191613 is about 8954.9769960620. The cubic root of 80191613 is about 431.2306784594.

The spelling of 80191613 in words is "eighty million, one hundred ninety-one thousand, six hundred thirteen".