91023071497 has 2 divisors, whose sum is σ = 91023071498. Its totient is φ = 91023071496.

The previous prime is 91023071467. The next prime is 91023071509. The reversal of 91023071497 is 79417032019.

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., 59416987536 + 31606083961 = 243756^2 + 177781^2 .

It is a cyclic number.

It is not a de Polignac number, because 91023071497 - 2³¹ = 88875587849 is a prime.

It is not a weakly prime, because it can be changed into another prime (91023071437) 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, 45511535748 + 45511535749.

It is an arithmetic number, because the mean of its divisors is an integer number (45511535749).

Almost surely, 2^91023071497 is an apocalyptic number.

It is an amenable number.

91023071497 is a deficient number, since it is larger than the sum of its proper divisors (1).

91023071497 is an equidigital number, since it uses as much as digits as its factorization.

91023071497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 43.

The spelling of 91023071497 in words is "ninety-one billion, twenty-three million, seventy-one thousand, four hundred ninety-seven".