80878531 has 2 divisors, whose sum is σ = 80878532. Its totient is φ = 80878530.

The previous prime is 80878517. The next prime is 80878543. The reversal of 80878531 is 13587808.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 80878531 - 2⁷ = 80878403 is a prime.

It is a super-2 number, since 2×80878531² = 13082673553435922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (80878561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40439265 + 40439266.

It is an arithmetic number, because the mean of its divisors is an integer number (40439266).

Almost surely, 2^80878531 is an apocalyptic number.

80878531 is a deficient number, since it is larger than the sum of its proper divisors (1).

80878531 is an equidigital number, since it uses as much as digits as its factorization.

80878531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 80878531 is about 8993.2491903650. The cubic root of 80878531 is about 432.4584806502.

The spelling of 80878531 in words is "eighty million, eight hundred seventy-eight thousand, five hundred thirty-one".