9090909101 has 4 divisors (see below), whose sum is σ = 9180918204. Its totient is φ = 9000900000.

The previous prime is 9090909031. The next prime is 9090909127. The reversal of 9090909101 is 1019090909.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1019090909 = 101 ⋅10090009.

It can be written as a sum of positive squares in 2 ways, for example, as 8473386601 + 617522500 = 92051^2 + 24850^2 .

It is a cyclic number.

It is not a de Polignac number, because 9090909101 - 2¹⁰ = 9090908077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9090909701) 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, 45004400 + ... + 45004601.

It is an arithmetic number, because the mean of its divisors is an integer number (2295229551).

Almost surely, 2^9090909101 is an apocalyptic number.

It is an amenable number.

9090909101 is a deficient number, since it is larger than the sum of its proper divisors (90009103).

9090909101 is a wasteful number, since it uses less digits than its factorization.

9090909101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90009102.

The product of its (nonzero) digits is 6561, while the sum is 38.

The square root of 9090909101 is about 95346.2589774764. The cubic root of 9090909101 is about 2087.0640231954.

The spelling of 9090909101 in words is "nine billion, ninety million, nine hundred nine thousand, one hundred one".