9100012861 has 4 divisors (see below), whose sum is σ = 9104801724. Its totient is φ = 9095224000.

The previous prime is 9100012783. The next prime is 9100012871. The reversal of 9100012861 is 1682100019.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1262451961 + 7837560900 = 35531^2 + 88530^2 .

It is a cyclic number.

It is not a de Polignac number, because 9100012861 - 2²⁹ = 8563141949 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 (9100012871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2391580 + ... + 2395381.

It is an arithmetic number, because the mean of its divisors is an integer number (2276200431).

Almost surely, 2^9100012861 is an apocalyptic number.

It is an amenable number.

9100012861 is a deficient number, since it is larger than the sum of its proper divisors (4788863).

9100012861 is a wasteful number, since it uses less digits than its factorization.

9100012861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4788862.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 9100012861 is about 95393.9875516272. The cubic root of 9100012861 is about 2087.7604622042.

The spelling of 9100012861 in words is "nine billion, one hundred million, twelve thousand, eight hundred sixty-one".