219968931 has 32 divisors (see below), whose sum is σ = 361912320. Its totient is φ = 115726464.

The previous prime is 219968923. The next prime is 219969017. The reversal of 219968931 is 139869912.

It is not a de Polignac number, because 219968931 - 2³ = 219968923 is a prime.

It is a super-2 number, since 2×219968931² = 96772661210565522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (219966931) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 138166 + ... + 139748.

It is an arithmetic number, because the mean of its divisors is an integer number (11309760).

Almost surely, 2^219968931 is an apocalyptic number.

219968931 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

219968931 is a deficient number, since it is larger than the sum of its proper divisors (141943389).

219968931 is a wasteful number, since it uses less digits than its factorization.

219968931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2115.

The product of its digits is 209952, while the sum is 48.

The square root of 219968931 is about 14831.3496014355. The cubic root of 219968931 is about 603.6526545127.

The spelling of 219968931 in words is "two hundred nineteen million, nine hundred sixty-eight thousand, nine hundred thirty-one".