78383381 has 2 divisors, whose sum is σ = 78383382. Its totient is φ = 78383380.

The previous prime is 78383377. The next prime is 78383411. The reversal of 78383381 is 18338387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46922500 + 31460881 = 6850^2 + 5609^2 .

It is an emirp because it is prime and its reverse (18338387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78383381 - 2² = 78383377 is a prime.

It is a super-2 number, since 2×78383381² = 12287908833982322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78383581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39191690 + 39191691.

It is an arithmetic number, because the mean of its divisors is an integer number (39191691).

Almost surely, 2^78383381 is an apocalyptic number.

It is an amenable number.

78383381 is a deficient number, since it is larger than the sum of its proper divisors (1).

78383381 is an equidigital number, since it uses as much as digits as its factorization.

78383381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 41.

The square root of 78383381 is about 8853.4389363682. The cubic root of 78383381 is about 427.9647483850.

The spelling of 78383381 in words is "seventy-eight million, three hundred eighty-three thousand, three hundred eighty-one".