7291531997 has 2 divisors, whose sum is σ = 7291531998. Its totient is φ = 7291531996.

The previous prime is 7291531993. The next prime is 7291532029. The reversal of 7291531997 is 7991351927.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7223980036 + 67551961 = 84994^2 + 8219^2 .

It is a cyclic number.

It is not a de Polignac number, because 7291531997 - 2² = 7291531993 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7291531991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3645765998 + 3645765999.

It is an arithmetic number, because the mean of its divisors is an integer number (3645765999).

Almost surely, 2^7291531997 is an apocalyptic number.

It is an amenable number.

7291531997 is a deficient number, since it is larger than the sum of its proper divisors (1).

7291531997 is an equidigital number, since it uses as much as digits as its factorization.

7291531997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1071630, while the sum is 53.

The square root of 7291531997 is about 85390.4678345306. The cubic root of 7291531997 is about 1939.1270381605.

The spelling of 7291531997 in words is "seven billion, two hundred ninety-one million, five hundred thirty-one thousand, nine hundred ninety-seven".