79090381 has 2 divisors, whose sum is σ = 79090382. Its totient is φ = 79090380.

The previous prime is 79090367. The next prime is 79090411. The reversal of 79090381 is 18309097.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77968900 + 1121481 = 8830^2 + 1059^2 .

It is an emirp because it is prime and its reverse (18309097) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79090381 - 2⁹ = 79089869 is a prime.

It is a super-2 number, since 2×79090381² = 12510576733450322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 79090381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79090321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39545190 + 39545191.

It is an arithmetic number, because the mean of its divisors is an integer number (39545191).

Almost surely, 2^79090381 is an apocalyptic number.

It is an amenable number.

79090381 is a deficient number, since it is larger than the sum of its proper divisors (1).

79090381 is an equidigital number, since it uses as much as digits as its factorization.

79090381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 79090381 is about 8893.2772924271. The cubic root of 79090381 is about 429.2476134407.

The spelling of 79090381 in words is "seventy-nine million, ninety thousand, three hundred eighty-one".