80684957 has 2 divisors, whose sum is σ = 80684958. Its totient is φ = 80684956.

The previous prime is 80684939. The next prime is 80684987. The reversal of 80684957 is 75948608.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80478841 + 206116 = 8971^2 + 454^2 .

It is a cyclic number.

It is not a de Polignac number, because 80684957 - 2¹⁴ = 80668573 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80684927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40342478 + 40342479.

It is an arithmetic number, because the mean of its divisors is an integer number (40342479).

Almost surely, 2^80684957 is an apocalyptic number.

It is an amenable number.

80684957 is a deficient number, since it is larger than the sum of its proper divisors (1).

80684957 is an equidigital number, since it uses as much as digits as its factorization.

80684957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 483840, while the sum is 47.

The square root of 80684957 is about 8982.4805594001. The cubic root of 80684957 is about 432.1131908614.

The spelling of 80684957 in words is "eighty million, six hundred eighty-four thousand, nine hundred fifty-seven".