90671281 has 2 divisors, whose sum is σ = 90671282. Its totient is φ = 90671280.

The previous prime is 90671239. The next prime is 90671293. The reversal of 90671281 is 18217609.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88736400 + 1934881 = 9420^2 + 1391^2 .

It is a cyclic number.

It is not a de Polignac number, because 90671281 - 2¹⁷ = 90540209 is a prime.

It is a super-2 number, since 2×90671281² = 16442562396361922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90674281) 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, 45335640 + 45335641.

It is an arithmetic number, because the mean of its divisors is an integer number (45335641).

Almost surely, 2^90671281 is an apocalyptic number.

It is an amenable number.

90671281 is a deficient number, since it is larger than the sum of its proper divisors (1).

90671281 is an equidigital number, since it uses as much as digits as its factorization.

90671281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 90671281 is about 9522.1468692727. The cubic root of 90671281 is about 449.2518944446.

The spelling of 90671281 in words is "ninety million, six hundred seventy-one thousand, two hundred eighty-one".