79277543381 has 2 divisors, whose sum is σ = 79277543382. Its totient is φ = 79277543380.

The previous prime is 79277543363. The next prime is 79277543431. The reversal of 79277543381 is 18334577297.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61439536900 + 17838006481 = 247870^2 + 133559^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79277543381 is a prime.

It is a super-2 number, since 2×79277543381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79277543881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39638771690 + 39638771691.

It is an arithmetic number, because the mean of its divisors is an integer number (39638771691).

Almost surely, 2^79277543381 is an apocalyptic number.

It is an amenable number.

79277543381 is a deficient number, since it is larger than the sum of its proper divisors (1).

79277543381 is an equidigital number, since it uses as much as digits as its factorization.

79277543381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8890560, while the sum is 56.

The spelling of 79277543381 in words is "seventy-nine billion, two hundred seventy-seven million, five hundred forty-three thousand, three hundred eighty-one".