78583381 has 2 divisors, whose sum is σ = 78583382. Its totient is φ = 78583380.

The previous prime is 78583319. The next prime is 78583391. The reversal of 78583381 is 18338587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64400625 + 14182756 = 8025^2 + 3766^2 .

It is an emirp because it is prime and its reverse (18338587) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78583381 - 2⁹ = 78582869 is a prime.

It is a super-2 number, since 2×78583381² = 12350695538782322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78583391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39291690 + 39291691.

It is an arithmetic number, because the mean of its divisors is an integer number (39291691).

Almost surely, 2^78583381 is an apocalyptic number.

It is an amenable number.

78583381 is a deficient number, since it is larger than the sum of its proper divisors (1).

78583381 is an equidigital number, since it uses as much as digits as its factorization.

78583381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 43.

The square root of 78583381 is about 8864.7267865400. The cubic root of 78583381 is about 428.3284320003.

The spelling of 78583381 in words is "seventy-eight million, five hundred eighty-three thousand, three hundred eighty-one".