79311481 has 2 divisors, whose sum is σ = 79311482. Its totient is φ = 79311480.

The previous prime is 79311467. The next prime is 79311487. The reversal of 79311481 is 18411397.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77088400 + 2223081 = 8780^2 + 1491^2 .

It is an emirp because it is prime and its reverse (18411397) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79311481 is a prime.

It is a super-2 number, since 2×79311481² = 12580622036826722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79311487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39655740 + 39655741.

It is an arithmetic number, because the mean of its divisors is an integer number (39655741).

Almost surely, 2^79311481 is an apocalyptic number.

It is an amenable number.

79311481 is a deficient number, since it is larger than the sum of its proper divisors (1).

79311481 is an equidigital number, since it uses as much as digits as its factorization.

79311481 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 79311481 is about 8905.6993549075. The cubic root of 79311481 is about 429.6472336597.

The spelling of 79311481 in words is "seventy-nine million, three hundred eleven thousand, four hundred eighty-one".