90211567 has 2 divisors, whose sum is σ = 90211568. Its totient is φ = 90211566.

The previous prime is 90211559. The next prime is 90211577. The reversal of 90211567 is 76511209.

It is a weak prime.

It is an emirp because it is prime and its reverse (76511209) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90211567 - 2³ = 90211559 is a prime.

It is equal to p_5228581 and since 90211567 and 5228581 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90211577) 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, 45105783 + 45105784.

It is an arithmetic number, because the mean of its divisors is an integer number (45105784).

Almost surely, 2^90211567 is an apocalyptic number.

90211567 is a deficient number, since it is larger than the sum of its proper divisors (1).

90211567 is an equidigital number, since it uses as much as digits as its factorization.

90211567 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 90211567 is about 9497.9769951290. The cubic root of 90211567 is about 448.4913544333.

The spelling of 90211567 in words is "ninety million, two hundred eleven thousand, five hundred sixty-seven".