80016491 has 2 divisors, whose sum is σ = 80016492. Its totient is φ = 80016490.

The previous prime is 80016473. The next prime is 80016511. The reversal of 80016491 is 19461008.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 80016491 - 2²⁶ = 12907627 is a prime.

It is not a weakly prime, because it can be changed into another prime (80016451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40008245 + 40008246.

It is an arithmetic number, because the mean of its divisors is an integer number (40008246).

Almost surely, 2^80016491 is an apocalyptic number.

80016491 is a deficient number, since it is larger than the sum of its proper divisors (1).

80016491 is an equidigital number, since it uses as much as digits as its factorization.

80016491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 80016491 is about 8945.1937374212. The cubic root of 80016491 is about 430.9165432909.

Adding to 80016491 its reverse (19461008), we get a palindrome (99477499).

The spelling of 80016491 in words is "eighty million, sixteen thousand, four hundred ninety-one".