80491949 has 2 divisors, whose sum is σ = 80491950. Its totient is φ = 80491948.

The previous prime is 80491933. The next prime is 80491951. The reversal of 80491949 is 94919408.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48930025 + 31561924 = 6995^2 + 5618^2 .

It is a cyclic number.

It is not a de Polignac number, because 80491949 - 2⁴ = 80491933 is a prime.

Together with 80491951, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80499949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40245974 + 40245975.

It is an arithmetic number, because the mean of its divisors is an integer number (40245975).

Almost surely, 2^80491949 is an apocalyptic number.

It is an amenable number.

80491949 is a deficient number, since it is larger than the sum of its proper divisors (1).

80491949 is an equidigital number, since it uses as much as digits as its factorization.

80491949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 80491949 is about 8971.7305465557. The cubic root of 80491949 is about 431.7683603986.

The spelling of 80491949 in words is "eighty million, four hundred ninety-one thousand, nine hundred forty-nine".