78054491 has 2 divisors, whose sum is σ = 78054492. Its totient is φ = 78054490.

The previous prime is 78054481. The next prime is 78054511. The reversal of 78054491 is 19445087.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78054491 is a prime.

It is not a weakly prime, because it can be changed into another prime (78054401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39027245 + 39027246.

It is an arithmetic number, because the mean of its divisors is an integer number (39027246).

Almost surely, 2^78054491 is an apocalyptic number.

78054491 is a deficient number, since it is larger than the sum of its proper divisors (1).

78054491 is an equidigital number, since it uses as much as digits as its factorization.

78054491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 78054491 is about 8834.8452731217. The cubic root of 78054491 is about 427.3653413530.

The spelling of 78054491 in words is "seventy-eight million, fifty-four thousand, four hundred ninety-one".