90901009 has 4 divisors (see below), whose sum is σ = 90923760. Its totient is φ = 90878260.

The previous prime is 90901003. The next prime is 90901039. The reversal of 90901009 is 90010909.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90010909 = 257 ⋅350237.

It is a cyclic number.

It is not a de Polignac number, because 90901009 - 2³ = 90901001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90901001) 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, 3619 + ... + 13960.

It is an arithmetic number, because the mean of its divisors is an integer number (22730940).

Almost surely, 2^90901009 is an apocalyptic number.

It is an amenable number.

90901009 is a deficient number, since it is larger than the sum of its proper divisors (22751).

90901009 is a wasteful number, since it uses less digits than its factorization.

90901009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22750.

The product of its (nonzero) digits is 729, while the sum is 28.

The square root of 90901009 is about 9534.2020641478. The cubic root of 90901009 is about 449.6309880180.

The spelling of 90901009 in words is "ninety million, nine hundred one thousand, nine".