791521097 has 2 divisors, whose sum is σ = 791521098. Its totient is φ = 791521096.

The previous prime is 791521069. The next prime is 791521121. The reversal of 791521097 is 790125197.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 423495241 + 368025856 = 20579^2 + 19184^2 .

It is an emirp because it is prime and its reverse (790125197) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 791521097 - 2⁸ = 791520841 is a prime.

It is not a weakly prime, because it can be changed into another prime (791521007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 395760548 + 395760549.

It is an arithmetic number, because the mean of its divisors is an integer number (395760549).

Almost surely, 2^791521097 is an apocalyptic number.

It is an amenable number.

791521097 is a deficient number, since it is larger than the sum of its proper divisors (1).

791521097 is an equidigital number, since it uses as much as digits as its factorization.

791521097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39690, while the sum is 41.

The square root of 791521097 is about 28133.9847337699. The cubic root of 791521097 is about 925.0264796900.

The spelling of 791521097 in words is "seven hundred ninety-one million, five hundred twenty-one thousand, ninety-seven".