80699129 has 6 divisors (see below), whose sum is σ = 93874554. Its totient is φ = 69170640.

The previous prime is 80699123. The next prime is 80699149. The reversal of 80699129 is 92199608.

It can be written as a sum of positive squares in only one way, i.e., 59290000 + 21409129 = 7700^2 + 4627^2 .

It is a de Polignac number, because none of the positive numbers 2^k-80699129 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 80699129.

It is not an unprimeable number, because it can be changed into a prime (80699123) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 823412 + ... + 823509.

It is an arithmetic number, because the mean of its divisors is an integer number (15645759).

Almost surely, 2^80699129 is an apocalyptic number.

It is an amenable number.

80699129 is a deficient number, since it is larger than the sum of its proper divisors (13175425).

80699129 is a wasteful number, since it uses less digits than its factorization.

80699129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1646935 (or 1646928 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 80699129 is about 8983.2693937118. The cubic root of 80699129 is about 432.1384890494.

The spelling of 80699129 in words is "eighty million, six hundred ninety-nine thousand, one hundred twenty-nine".