672081491 has 2 divisors, whose sum is σ = 672081492. Its totient is φ = 672081490.

The previous prime is 672081481. The next prime is 672081493. The reversal of 672081491 is 194180276.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 672081491 - 2⁶ = 672081427 is a prime.

Together with 672081493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (672081493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336040745 + 336040746.

It is an arithmetic number, because the mean of its divisors is an integer number (336040746).

Almost surely, 2^672081491 is an apocalyptic number.

672081491 is a deficient number, since it is larger than the sum of its proper divisors (1).

672081491 is an equidigital number, since it uses as much as digits as its factorization.

672081491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 672081491 is about 25924.5345377694. The cubic root of 672081491 is about 875.9392324388.

The spelling of 672081491 in words is "six hundred seventy-two million, eighty-one thousand, four hundred ninety-one".