81652859 has 2 divisors, whose sum is σ = 81652860. Its totient is φ = 81652858.

The previous prime is 81652843. The next prime is 81652871. The reversal of 81652859 is 95825618.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81652859 - 2⁴ = 81652843 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81652889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40826429 + 40826430.

It is an arithmetic number, because the mean of its divisors is an integer number (40826430).

Almost surely, 2^81652859 is an apocalyptic number.

81652859 is a deficient number, since it is larger than the sum of its proper divisors (1).

81652859 is an equidigital number, since it uses as much as digits as its factorization.

81652859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172800, while the sum is 44.

The square root of 81652859 is about 9036.1971536703. The cubic root of 81652859 is about 433.8342132607.

The spelling of 81652859 in words is "eighty-one million, six hundred fifty-two thousand, eight hundred fifty-nine".