2101931961 has 8 divisors (see below), whose sum is σ = 2848520064. Its totient is φ = 1378315920.

The previous prime is 2101931947. The next prime is 2101931963. The reversal of 2101931961 is 1691391012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2101931961 - 2¹⁰ = 2101930937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2101931963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5742801 + ... + 5743166.

It is an arithmetic number, because the mean of its divisors is an integer number (356065008).

Almost surely, 2^2101931961 is an apocalyptic number.

It is an amenable number.

2101931961 is a deficient number, since it is larger than the sum of its proper divisors (746588103).

2101931961 is a wasteful number, since it uses less digits than its factorization.

2101931961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11486031.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 2101931961 is about 45846.8315262898. The cubic root of 2101931961 is about 1280.9717476390.

The spelling of 2101931961 in words is "two billion, one hundred one million, nine hundred thirty-one thousand, nine hundred sixty-one".