91722193037 has 2 divisors, whose sum is σ = 91722193038. Its totient is φ = 91722193036.

The previous prime is 91722193033. The next prime is 91722193117. The reversal of 91722193037 is 73039122719.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76499815396 + 15222377641 = 276586^2 + 123379^2 .

It is a cyclic number.

It is not a de Polignac number, because 91722193037 - 2² = 91722193033 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91722193033) 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, 45861096518 + 45861096519.

It is an arithmetic number, because the mean of its divisors is an integer number (45861096519).

Almost surely, 2^91722193037 is an apocalyptic number.

It is an amenable number.

91722193037 is a deficient number, since it is larger than the sum of its proper divisors (1).

91722193037 is an equidigital number, since it uses as much as digits as its factorization.

91722193037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 142884, while the sum is 44.

The spelling of 91722193037 in words is "ninety-one billion, seven hundred twenty-two million, one hundred ninety-three thousand, thirty-seven".