90550001 has 2 divisors, whose sum is σ = 90550002. Its totient is φ = 90550000.

The previous prime is 90549983. The next prime is 90550027. The reversal of 90550001 is 10005509.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87909376 + 2640625 = 9376^2 + 1625^2 .

It is an emirp because it is prime and its reverse (10005509) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90550001 - 2⁶ = 90549937 is a prime.

It is a super-2 number, since 2×90550001² = 16398605362200002, which contains 22 as substring.

It is equal to p_5247101 and since 90550001 and 5247101 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (90550051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45275000 + 45275001.

It is an arithmetic number, because the mean of its divisors is an integer number (45275001).

Almost surely, 2^90550001 is an apocalyptic number.

It is an amenable number.

90550001 is a deficient number, since it is larger than the sum of its proper divisors (1).

90550001 is an equidigital number, since it uses as much as digits as its factorization.

90550001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225, while the sum is 20.

The square root of 90550001 is about 9515.7764265456. The cubic root of 90550001 is about 449.0515017734.

The spelling of 90550001 in words is "ninety million, five hundred fifty thousand, one".