90250001 has 4 divisors (see below), whose sum is σ = 93362100. Its totient is φ = 87137904.

The previous prime is 90249997. The next prime is 90250007. The reversal of 90250001 is 10005209.

It is a Cunningham number, because it is equal to 9500²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47334400 + 42915601 = 6880^2 + 6551^2 .

It is a cyclic number.

It is not a de Polignac number, because 90250001 - 2² = 90249997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90250007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1556006 + ... + 1556063.

It is an arithmetic number, because the mean of its divisors is an integer number (23340525).

Almost surely, 2^90250001 is an apocalyptic number.

It is an amenable number.

90250001 is a deficient number, since it is larger than the sum of its proper divisors (3112099).

90250001 is a wasteful number, since it uses less digits than its factorization.

90250001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3112098.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 90250001 is about 9500.0000526316. Note that the first 4 decimals coincide. The cubic root of 90250001 is about 448.5550375800. Note that the first 3 decimals are identical.

The spelling of 90250001 in words is "ninety million, two hundred fifty thousand, one".