81379141 has 2 divisors, whose sum is σ = 81379142. Its totient is φ = 81379140.

The previous prime is 81379117. The next prime is 81379157. The reversal of 81379141 is 14197318.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73170916 + 8208225 = 8554^2 + 2865^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81379141 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81379097 and 81379106.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81379241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40689570 + 40689571.

It is an arithmetic number, because the mean of its divisors is an integer number (40689571).

Almost surely, 2^81379141 is an apocalyptic number.

It is an amenable number.

81379141 is a deficient number, since it is larger than the sum of its proper divisors (1).

81379141 is an equidigital number, since it uses as much as digits as its factorization.

81379141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 34.

The square root of 81379141 is about 9021.0387982760. The cubic root of 81379141 is about 433.3489019390.

The spelling of 81379141 in words is "eighty-one million, three hundred seventy-nine thousand, one hundred forty-one".