80878249 has 2 divisors, whose sum is σ = 80878250. Its totient is φ = 80878248.

The previous prime is 80878247. The next prime is 80878277. The reversal of 80878249 is 94287808.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67240000 + 13638249 = 8200^2 + 3693^2 .

It is a cyclic number.

It is not a de Polignac number, because 80878249 - 2¹ = 80878247 is a prime.

It is a super-2 number, since 2×80878249² = 13082582322612002, which contains 22 as substring.

Together with 80878247, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 80878199 and 80878208.

It is not a weakly prime, because it can be changed into another prime (80878241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40439124 + 40439125.

It is an arithmetic number, because the mean of its divisors is an integer number (40439125).

Almost surely, 2^80878249 is an apocalyptic number.

It is an amenable number.

80878249 is a deficient number, since it is larger than the sum of its proper divisors (1).

80878249 is an equidigital number, since it uses as much as digits as its factorization.

80878249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 258048, while the sum is 46.

The square root of 80878249 is about 8993.2335119244. The cubic root of 80878249 is about 432.4579780305.

The spelling of 80878249 in words is "eighty million, eight hundred seventy-eight thousand, two hundred forty-nine".