81482857 has 2 divisors, whose sum is σ = 81482858. Its totient is φ = 81482856.

The previous prime is 81482851. The next prime is 81482873. The reversal of 81482857 is 75828418.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69538921 + 11943936 = 8339^2 + 3456^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81482857 is a prime.

It is not a weakly prime, because it can be changed into another prime (81482851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40741428 + 40741429.

It is an arithmetic number, because the mean of its divisors is an integer number (40741429).

Almost surely, 2^81482857 is an apocalyptic number.

It is an amenable number.

81482857 is a deficient number, since it is larger than the sum of its proper divisors (1).

81482857 is an equidigital number, since it uses as much as digits as its factorization.

81482857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 143360, while the sum is 43.

The square root of 81482857 is about 9026.7855297442. The cubic root of 81482857 is about 433.5329217986.

The spelling of 81482857 in words is "eighty-one million, four hundred eighty-two thousand, eight hundred fifty-seven".