80156729 has 2 divisors, whose sum is σ = 80156730. Its totient is φ = 80156728.

The previous prime is 80156719. The next prime is 80156743. The reversal of 80156729 is 92765108.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79210000 + 946729 = 8900^2 + 973^2 .

It is a cyclic number.

It is not a de Polignac number, because 80156729 - 2⁸ = 80156473 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 80156692 and 80156701.

It is not a weakly prime, because it can be changed into another prime (80156719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40078364 + 40078365.

It is an arithmetic number, because the mean of its divisors is an integer number (40078365).

Almost surely, 2^80156729 is an apocalyptic number.

It is an amenable number.

80156729 is a deficient number, since it is larger than the sum of its proper divisors (1).

80156729 is an equidigital number, since it uses as much as digits as its factorization.

80156729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 80156729 is about 8953.0290404980. The cubic root of 80156729 is about 431.1681397797.

The spelling of 80156729 in words is "eighty million, one hundred fifty-six thousand, seven hundred twenty-nine".