80681987 has 2 divisors, whose sum is σ = 80681988. Its totient is φ = 80681986.

The previous prime is 80681897. The next prime is 80682001. The reversal of 80681987 is 78918608.

Together with previous prime (80681897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 80681987 - 2²² = 76487683 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (80681387) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40340993 + 40340994.

It is an arithmetic number, because the mean of its divisors is an integer number (40340994).

Almost surely, 2^80681987 is an apocalyptic number.

80681987 is a deficient number, since it is larger than the sum of its proper divisors (1).

80681987 is an equidigital number, since it uses as much as digits as its factorization.

80681987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 80681987 is about 8982.3152360625. The cubic root of 80681987 is about 432.1078887912.

The spelling of 80681987 in words is "eighty million, six hundred eighty-one thousand, nine hundred eighty-seven".