90306691 has 2 divisors, whose sum is σ = 90306692. Its totient is φ = 90306690.

The previous prime is 90306679. The next prime is 90306707. The reversal of 90306691 is 19660309.

It is a weak prime.

It is an emirp because it is prime and its reverse (19660309) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90306691 - 2¹³ = 90298499 is a prime.

It is not a weakly prime, because it can be changed into another prime (90306611) 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, 45153345 + 45153346.

It is an arithmetic number, because the mean of its divisors is an integer number (45153346).

Almost surely, 2^90306691 is an apocalyptic number.

90306691 is a deficient number, since it is larger than the sum of its proper divisors (1).

90306691 is an equidigital number, since it uses as much as digits as its factorization.

90306691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 90306691 is about 9502.9832684268. The cubic root of 90306691 is about 448.6489369794.

The spelling of 90306691 in words is "ninety million, three hundred six thousand, six hundred ninety-one".