80321491 has 2 divisors, whose sum is σ = 80321492. Its totient is φ = 80321490.

The previous prime is 80321477. The next prime is 80321509. The reversal of 80321491 is 19412308.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 80321491 - 2⁵ = 80321459 is a prime.

It is not a weakly prime, because it can be changed into another prime (80321411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40160745 + 40160746.

It is an arithmetic number, because the mean of its divisors is an integer number (40160746).

Almost surely, 2^80321491 is an apocalyptic number.

80321491 is a deficient number, since it is larger than the sum of its proper divisors (1).

80321491 is an equidigital number, since it uses as much as digits as its factorization.

80321491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 80321491 is about 8962.2257838106. The cubic root of 80321491 is about 431.4633593542.

Adding to 80321491 its reverse (19412308), we get a palindrome (99733799).

The spelling of 80321491 in words is "eighty million, three hundred twenty-one thousand, four hundred ninety-one".