90497161 has 2 divisors, whose sum is σ = 90497162. Its totient is φ = 90497160.

The previous prime is 90497149. The next prime is 90497189. The reversal of 90497161 is 16179409.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74046025 + 16451136 = 8605^2 + 4056^2 .

It is a cyclic number.

It is not a de Polignac number, because 90497161 - 2⁹ = 90496649 is a prime.

It is a super-2 number, since 2×90497161² = 16379472298119842, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 90497161.

It is not a weakly prime, because it can be changed into another prime (90497761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45248580 + 45248581.

It is an arithmetic number, because the mean of its divisors is an integer number (45248581).

Almost surely, 2^90497161 is an apocalyptic number.

It is an amenable number.

90497161 is a deficient number, since it is larger than the sum of its proper divisors (1).

90497161 is an equidigital number, since it uses as much as digits as its factorization.

90497161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 90497161 is about 9512.9995795227. Note that the first 3 decimals coincide. The cubic root of 90497161 is about 448.9641375252.

The spelling of 90497161 in words is "ninety million, four hundred ninety-seven thousand, one hundred sixty-one".