2217139931 has 4 divisors (see below), whose sum is σ = 2219329632. Its totient is φ = 2214950232.

The previous prime is 2217139927. The next prime is 2217139943. The reversal of 2217139931 is 1399317122.

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

It is a cyclic number.

It is not a de Polignac number, because 2217139931 - 2² = 2217139927 is a prime.

It is a super-2 number, since 2×2217139931² = 9831418947269369522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2217139921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1093331 + ... + 1095356.

It is an arithmetic number, because the mean of its divisors is an integer number (554832408).

Almost surely, 2^2217139931 is an apocalyptic number.

2217139931 is a deficient number, since it is larger than the sum of its proper divisors (2189701).

2217139931 is a wasteful number, since it uses less digits than its factorization.

2217139931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2189700.

The product of its digits is 20412, while the sum is 38.

The square root of 2217139931 is about 47086.5153839186. The cubic root of 2217139931 is about 1303.9602961536.

The spelling of 2217139931 in words is "two billion, two hundred seventeen million, one hundred thirty-nine thousand, nine hundred thirty-one".