90249999 has 32 divisors (see below), whose sum is σ = 145981440. Its totient is φ = 48477792.

The previous prime is 90249997. The next prime is 90250007. The reversal of 90249999 is 99994209.

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

It is not a de Polignac number, because 90249999 - 2¹ = 90249997 is a prime.

90249999 is a modest number, since divided by 9999 gives 9024 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90249997) 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 in 31 ways as a sum of consecutive naturals, for example, 26914 + ... + 30080.

It is an arithmetic number, because the mean of its divisors is an integer number (4561920).

Almost surely, 2^90249999 is an apocalyptic number.

90249999 is a deficient number, since it is larger than the sum of its proper divisors (55731441).

90249999 is a wasteful number, since it uses less digits than its factorization.

90249999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3259.

The product of its (nonzero) digits is 472392, while the sum is 51.

The square root of 90249999 is about 9499.9999473684. Note that the first 4 decimals coincide. The cubic root of 90249999 is about 448.5550342665. Note that the first 3 decimals are identical.

The spelling of 90249999 in words is "ninety million, two hundred forty-nine thousand, nine hundred ninety-nine".