78453491 has 2 divisors, whose sum is σ = 78453492. Its totient is φ = 78453490.

The previous prime is 78453469. The next prime is 78453493. The reversal of 78453491 is 19435487.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78453491 is a prime.

Together with 78453493, 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 (78453493) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39226745 + 39226746.

It is an arithmetic number, because the mean of its divisors is an integer number (39226746).

Almost surely, 2^78453491 is an apocalyptic number.

78453491 is a deficient number, since it is larger than the sum of its proper divisors (1).

78453491 is an equidigital number, since it uses as much as digits as its factorization.

78453491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 41.

The square root of 78453491 is about 8857.3975297488. The cubic root of 78453491 is about 428.0923080228.

The spelling of 78453491 in words is "seventy-eight million, four hundred fifty-three thousand, four hundred ninety-one".