91903773097 has 2 divisors, whose sum is σ = 91903773098. Its totient is φ = 91903773096.

The previous prime is 91903773043. The next prime is 91903773113. The reversal of 91903773097 is 79037730919.

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., 91799304256 + 104468841 = 302984^2 + 10221^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91903773097 is a prime.

It is not a weakly prime, because it can be changed into another prime (91903773397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45951886548 + 45951886549.

It is an arithmetic number, because the mean of its divisors is an integer number (45951886549).

Almost surely, 2^91903773097 is an apocalyptic number.

It is an amenable number.

91903773097 is a deficient number, since it is larger than the sum of its proper divisors (1).

91903773097 is an equidigital number, since it uses as much as digits as its factorization.

91903773097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2250423, while the sum is 55.

The spelling of 91903773097 in words is "ninety-one billion, nine hundred three million, seven hundred seventy-three thousand, ninety-seven".