80356691 has 4 divisors (see below), whose sum is σ = 80547984. Its totient is φ = 80165400.

The previous prime is 80356669. The next prime is 80356693. The reversal of 80356691 is 19665308.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80356691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80356693) 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, 95015 + ... + 95856.

It is an arithmetic number, because the mean of its divisors is an integer number (20136996).

Almost surely, 2^80356691 is an apocalyptic number.

80356691 is a deficient number, since it is larger than the sum of its proper divisors (191293).

80356691 is a wasteful number, since it uses less digits than its factorization.

80356691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191292.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 80356691 is about 8964.1893665852. The cubic root of 80356691 is about 431.5263781553.

The spelling of 80356691 in words is "eighty million, three hundred fifty-six thousand, six hundred ninety-one".