9091010101 has 4 divisors (see below), whose sum is σ = 9181020204. Its totient is φ = 9001000000.

The previous prime is 9091010099. The next prime is 9091010141. The reversal of 9091010101 is 1010101909.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1010101909 = 101 ⋅10001009.

It can be written as a sum of positive squares in 2 ways, for example, as 6064359876 + 3026650225 = 77874^2 + 55015^2 .

It is a cyclic number.

It is not a de Polignac number, because 9091010101 - 2¹ = 9091010099 is a prime.

It is a Duffinian number.

9091010101 is a modest number, since divided by 10101 gives 9091 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9091010141) 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, 45004900 + ... + 45005101.

It is an arithmetic number, because the mean of its divisors is an integer number (2295255051).

Almost surely, 2^9091010101 is an apocalyptic number.

It is an amenable number.

9091010101 is a deficient number, since it is larger than the sum of its proper divisors (90010103).

9091010101 is a wasteful number, since it uses less digits than its factorization.

9091010101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90010102.

The product of its (nonzero) digits is 81, while the sum is 22.

The square root of 9091010101 is about 95346.7886244733. The cubic root of 9091010101 is about 2087.0717522606.

The spelling of 9091010101 in words is "nine billion, ninety-one million, ten thousand, one hundred one".