90611321 has 2 divisors, whose sum is σ = 90611322. Its totient is φ = 90611320.

The previous prime is 90611317. The next prime is 90611327. The reversal of 90611321 is 12311609.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53875600 + 36735721 = 7340^2 + 6061^2 .

It is an emirp because it is prime and its reverse (12311609) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90611321 - 2² = 90611317 is a prime.

It is a super-2 number, since 2×90611321² = 16420822986730082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90611327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45305660 + 45305661.

It is an arithmetic number, because the mean of its divisors is an integer number (45305661).

Almost surely, 2^90611321 is an apocalyptic number.

It is an amenable number.

90611321 is a deficient number, since it is larger than the sum of its proper divisors (1).

90611321 is an equidigital number, since it uses as much as digits as its factorization.

90611321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 90611321 is about 9518.9978989387. The cubic root of 90611321 is about 449.1528440315.

The spelling of 90611321 in words is "ninety million, six hundred eleven thousand, three hundred twenty-one".