79138061 has 2 divisors, whose sum is σ = 79138062. Its totient is φ = 79138060.

The previous prime is 79138051. The next prime is 79138109. The reversal of 79138061 is 16083197.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72352036 + 6786025 = 8506^2 + 2605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79138061 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79138001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39569030 + 39569031.

It is an arithmetic number, because the mean of its divisors is an integer number (39569031).

Almost surely, 2^79138061 is an apocalyptic number.

It is an amenable number.

79138061 is a deficient number, since it is larger than the sum of its proper divisors (1).

79138061 is an equidigital number, since it uses as much as digits as its factorization.

79138061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 79138061 is about 8895.9575650966. The cubic root of 79138061 is about 429.3338540790. Note that the first 3 decimals are identical.

The spelling of 79138061 in words is "seventy-nine million, one hundred thirty-eight thousand, sixty-one".