80537909 has 4 divisors (see below), whose sum is σ = 80558604. Its totient is φ = 80517216.

The previous prime is 80537869. The next prime is 80537911. The reversal of 80537909 is 90973508.

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 61858225 + 18679684 = 7865^2 + 4322^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80537909 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 (80537999) 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, 2552 + ... + 12945.

It is an arithmetic number, because the mean of its divisors is an integer number (20139651).

Almost surely, 2^80537909 is an apocalyptic number.

It is an amenable number.

80537909 is a deficient number, since it is larger than the sum of its proper divisors (20695).

80537909 is a wasteful number, since it uses less digits than its factorization.

80537909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20694.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 80537909 is about 8974.2915597834. The cubic root of 80537909 is about 431.8505230595.

The spelling of 80537909 in words is "eighty million, five hundred thirty-seven thousand, nine hundred nine".