79531997 has 2 divisors, whose sum is σ = 79531998. Its totient is φ = 79531996.

The previous prime is 79531993. The next prime is 79532009. The reversal of 79531997 is 79913597.

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., 70375321 + 9156676 = 8389^2 + 3026^2 .

It is an emirp because it is prime and its reverse (79913597) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79531997 - 2² = 79531993 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79531993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39765998 + 39765999.

It is an arithmetic number, because the mean of its divisors is an integer number (39765999).

Almost surely, 2^79531997 is an apocalyptic number.

It is an amenable number.

79531997 is a deficient number, since it is larger than the sum of its proper divisors (1).

79531997 is an equidigital number, since it uses as much as digits as its factorization.

79531997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 535815, while the sum is 50.

The square root of 79531997 is about 8918.0713722194. The cubic root of 79531997 is about 430.0450592767.

The spelling of 79531997 in words is "seventy-nine million, five hundred thirty-one thousand, nine hundred ninety-seven".