78104261 has 2 divisors, whose sum is σ = 78104262. Its totient is φ = 78104260.

The previous prime is 78104249. The next prime is 78104263. The reversal of 78104261 is 16240187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71081761 + 7022500 = 8431^2 + 2650^2 .

It is a cyclic number.

It is not a de Polignac number, because 78104261 - 2⁶ = 78104197 is a prime.

It is a super-2 number, since 2×78104261² = 12200551172712242, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 78104263, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78104263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39052130 + 39052131.

It is an arithmetic number, because the mean of its divisors is an integer number (39052131).

Almost surely, 2^78104261 is an apocalyptic number.

It is an amenable number.

78104261 is a deficient number, since it is larger than the sum of its proper divisors (1).

78104261 is an equidigital number, since it uses as much as digits as its factorization.

78104261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 78104261 is about 8837.6615119612. The cubic root of 78104261 is about 427.4561559176.

The spelling of 78104261 in words is "seventy-eight million, one hundred four thousand, two hundred sixty-one".