78092491 has 2 divisors, whose sum is σ = 78092492. Its totient is φ = 78092490.

The previous prime is 78092477. The next prime is 78092501. The reversal of 78092491 is 19429087.

It is a strong prime.

It is an emirp because it is prime and its reverse (19429087) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78092491 is a prime.

It is not a weakly prime, because it can be changed into another prime (78092401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39046245 + 39046246.

It is an arithmetic number, because the mean of its divisors is an integer number (39046246).

Almost surely, 2^78092491 is an apocalyptic number.

78092491 is a deficient number, since it is larger than the sum of its proper divisors (1).

78092491 is an equidigital number, since it uses as much as digits as its factorization.

78092491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 78092491 is about 8836.9955867365. The cubic root of 78092491 is about 427.4346828608.

The spelling of 78092491 in words is "seventy-eight million, ninety-two thousand, four hundred ninety-one".