91662497 has 2 divisors, whose sum is σ = 91662498. Its totient is φ = 91662496.

The previous prime is 91662457. The next prime is 91662509. The reversal of 91662497 is 79426619.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91221601 + 440896 = 9551^2 + 664^2 .

It is a cyclic number.

It is not a de Polignac number, because 91662497 - 2¹² = 91658401 is a prime.

It is not a weakly prime, because it can be changed into another prime (91662427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45831248 + 45831249.

It is an arithmetic number, because the mean of its divisors is an integer number (45831249).

Almost surely, 2^91662497 is an apocalyptic number.

It is an amenable number.

91662497 is a deficient number, since it is larger than the sum of its proper divisors (1).

91662497 is an equidigital number, since it uses as much as digits as its factorization.

91662497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 44.

The square root of 91662497 is about 9574.0533213472. The cubic root of 91662497 is about 450.8830348120.

The spelling of 91662497 in words is "ninety-one million, six hundred sixty-two thousand, four hundred ninety-seven".