80905537 has 2 divisors, whose sum is σ = 80905538. Its totient is φ = 80905536.

The previous prime is 80905523. The next prime is 80905571. The reversal of 80905537 is 73550908.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55413136 + 25492401 = 7444^2 + 5049^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80905537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 80905496 and 80905505.

It is not a weakly prime, because it can be changed into another prime (80905037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40452768 + 40452769.

It is an arithmetic number, because the mean of its divisors is an integer number (40452769).

Almost surely, 2^80905537 is an apocalyptic number.

It is an amenable number.

80905537 is a deficient number, since it is larger than the sum of its proper divisors (1).

80905537 is an equidigital number, since it uses as much as digits as its factorization.

80905537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 80905537 is about 8994.7505246116. The cubic root of 80905537 is about 432.5066090963.

The spelling of 80905537 in words is "eighty million, nine hundred five thousand, five hundred thirty-seven".