80129561 has 4 divisors (see below), whose sum is σ = 80147712. Its totient is φ = 80111412.

The previous prime is 80129557. The next prime is 80129563. The reversal of 80129561 is 16592108.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 80129561 - 2² = 80129557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80129563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2300 + ... + 12866.

It is an arithmetic number, because the mean of its divisors is an integer number (20036928).

Almost surely, 2^80129561 is an apocalyptic number.

It is an amenable number.

80129561 is a deficient number, since it is larger than the sum of its proper divisors (18151).

80129561 is a wasteful number, since it uses less digits than its factorization.

80129561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18150.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 80129561 is about 8951.5116600494. The cubic root of 80129561 is about 431.1194214756.

The spelling of 80129561 in words is "eighty million, one hundred twenty-nine thousand, five hundred sixty-one".