90910000001 has 4 divisors (see below), whose sum is σ = 91069772100. Its totient is φ = 90750227904.

The previous prime is 90909999953. The next prime is 90910000019. The reversal of 90910000001 is 10000001909.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10000001909 = 10009 ⋅999101.

It can be written as a sum of positive squares in 2 ways, for example, as 14499772225 + 76410227776 = 120415^2 + 276424^2 .

It is a cyclic number.

It is not a de Polignac number, because 90910000001 - 2¹⁴ = 90909983617 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 (90910000061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79885196 + ... + 79886333.

It is an arithmetic number, because the mean of its divisors is an integer number (22767443025).

Almost surely, 2^90910000001 is an apocalyptic number.

It is an amenable number.

90910000001 is a deficient number, since it is larger than the sum of its proper divisors (159772099).

90910000001 is a wasteful number, since it uses less digits than its factorization.

90910000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159772098.

The product of its (nonzero) digits is 81, while the sum is 20.

It can be divided in two parts, 909 and 10000001, that multiplied together give a palindrome (9090000909).

The spelling of 90910000001 in words is "ninety billion, nine hundred ten million, one", and thus it is an aban number.