90161293 has 2 divisors, whose sum is σ = 90161294. Its totient is φ = 90161292.

The previous prime is 90161287. The next prime is 90161329. The reversal of 90161293 is 39216109.

Together with next prime (90161329) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83411689 + 6749604 = 9133^2 + 2598^2 .

It is a cyclic number.

It is not a de Polignac number, because 90161293 - 2¹⁷ = 90030221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90161243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45080646 + 45080647.

It is an arithmetic number, because the mean of its divisors is an integer number (45080647).

Almost surely, 2^90161293 is an apocalyptic number.

It is an amenable number.

90161293 is a deficient number, since it is larger than the sum of its proper divisors (1).

90161293 is an equidigital number, since it uses as much as digits as its factorization.

90161293 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 90161293 is about 9495.3300627203. The cubic root of 90161293 is about 448.4080257099.

The spelling of 90161293 in words is "ninety million, one hundred sixty-one thousand, two hundred ninety-three".