79648381 has 2 divisors, whose sum is σ = 79648382. Its totient is φ = 79648380.

The previous prime is 79648367. The next prime is 79648391. The reversal of 79648381 is 18384697.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76842756 + 2805625 = 8766^2 + 1675^2 .

It is an emirp because it is prime and its reverse (18384697) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79648381 - 2⁷ = 79648253 is a prime.

It is a super-2 number, since 2×79648381² = 12687729191842322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79648301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39824190 + 39824191.

It is an arithmetic number, because the mean of its divisors is an integer number (39824191).

Almost surely, 2^79648381 is an apocalyptic number.

It is an amenable number.

79648381 is a deficient number, since it is larger than the sum of its proper divisors (1).

79648381 is an equidigital number, since it uses as much as digits as its factorization.

79648381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 46.

The square root of 79648381 is about 8924.5941644424. The cubic root of 79648381 is about 430.2547273850.

The spelling of 79648381 in words is "seventy-nine million, six hundred forty-eight thousand, three hundred eighty-one".