80861239 has 2 divisors, whose sum is σ = 80861240. Its totient is φ = 80861238.

The previous prime is 80861227. The next prime is 80861273. The reversal of 80861239 is 93216808.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80861239 is a prime.

It is a super-3 number, since 3×80861239³ (a number of 25 digits) contains 333 as substring.

It is a Chen prime.

It is equal to p_4716775 and since 80861239 and 4716775 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 80861198 and 80861207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80861219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40430619 + 40430620.

It is an arithmetic number, because the mean of its divisors is an integer number (40430620).

Almost surely, 2^80861239 is an apocalyptic number.

80861239 is a deficient number, since it is larger than the sum of its proper divisors (1).

80861239 is an equidigital number, since it uses as much as digits as its factorization.

80861239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 80861239 is about 8992.2877511788. The cubic root of 80861239 is about 432.4276582759.

The spelling of 80861239 in words is "eighty million, eight hundred sixty-one thousand, two hundred thirty-nine".