91520237 has 2 divisors, whose sum is σ = 91520238. Its totient is φ = 91520236.

The previous prime is 91520189. The next prime is 91520263. The reversal of 91520237 is 73202519.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91508356 + 11881 = 9566^2 + 109^2 .

It is a cyclic number.

It is not a de Polignac number, because 91520237 - 2²² = 87325933 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91520267) 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, 45760118 + 45760119.

It is an arithmetic number, because the mean of its divisors is an integer number (45760119).

Almost surely, 2^91520237 is an apocalyptic number.

It is an amenable number.

91520237 is a deficient number, since it is larger than the sum of its proper divisors (1).

91520237 is an equidigital number, since it uses as much as digits as its factorization.

91520237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 91520237 is about 9566.6209813079. The cubic root of 91520237 is about 450.6496575336.

The spelling of 91520237 in words is "ninety-one million, five hundred twenty thousand, two hundred thirty-seven".