80857111 has 2 divisors, whose sum is σ = 80857112. Its totient is φ = 80857110.

The previous prime is 80857069. The next prime is 80857129. The reversal of 80857111 is 11175808.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 80857111 - 2¹¹ = 80855063 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 (80857411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40428555 + 40428556.

It is an arithmetic number, because the mean of its divisors is an integer number (40428556).

Almost surely, 2^80857111 is an apocalyptic number.

80857111 is a deficient number, since it is larger than the sum of its proper divisors (1).

80857111 is an equidigital number, since it uses as much as digits as its factorization.

80857111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 31.

The square root of 80857111 is about 8992.0582182279. The cubic root of 80857111 is about 432.4202996132.

The spelling of 80857111 in words is "eighty million, eight hundred fifty-seven thousand, one hundred eleven".