80998649 has 2 divisors, whose sum is σ = 80998650. Its totient is φ = 80998648.

The previous prime is 80998637. The next prime is 80998651. The reversal of 80998649 is 94689908.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58369600 + 22629049 = 7640^2 + 4757^2 .

It is a cyclic number.

It is not a de Polignac number, because 80998649 - 2¹² = 80994553 is a prime.

It is a super-2 number, since 2×80998649² = 13121562279650402, which contains 22 as substring.

Together with 80998651, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 80998649.

It is not a weakly prime, because it can be changed into another prime (80998549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40499324 + 40499325.

It is an arithmetic number, because the mean of its divisors is an integer number (40499325).

Almost surely, 2^80998649 is an apocalyptic number.

It is an amenable number.

80998649 is a deficient number, since it is larger than the sum of its proper divisors (1).

80998649 is an equidigital number, since it uses as much as digits as its factorization.

80998649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1119744, while the sum is 53.

The square root of 80998649 is about 8999.9249441315. The cubic root of 80998649 is about 432.6724655490.

The spelling of 80998649 in words is "eighty million, nine hundred ninety-eight thousand, six hundred forty-nine".