91650161 has 2 divisors, whose sum is σ = 91650162. Its totient is φ = 91650160.

The previous prime is 91650109. The next prime is 91650199. The reversal of 91650161 is 16105619.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74995600 + 16654561 = 8660^2 + 4081^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91650161 is a prime.

It is a super-2 number, since 2×91650161² = 16799504022651842, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (91620161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45825080 + 45825081.

It is an arithmetic number, because the mean of its divisors is an integer number (45825081).

Almost surely, 2^91650161 is an apocalyptic number.

It is an amenable number.

91650161 is a deficient number, since it is larger than the sum of its proper divisors (1).

91650161 is an equidigital number, since it uses as much as digits as its factorization.

91650161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 91650161 is about 9573.4090584285. The cubic root of 91650161 is about 450.8628071914.

The spelling of 91650161 in words is "ninety-one million, six hundred fifty thousand, one hundred sixty-one".