109215931 has 6 divisors (see below), whose sum is σ = 120047396. Its totient is φ = 99287100.

The previous prime is 109215917. The next prime is 109215941. The reversal of 109215931 is 139512901.

It is a happy number.

It is not a de Polignac number, because 109215931 - 2¹¹ = 109213883 is a prime.

It is a super-2 number, since 2×109215931² = 23856239168393522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 109215893 and 109215902.

It is not an unprimeable number, because it can be changed into a prime (109215941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 451185 + ... + 451426.

Almost surely, 2^109215931 is an apocalyptic number.

109215931 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

109215931 is a deficient number, since it is larger than the sum of its proper divisors (10831465).

109215931 is an equidigital number, since it uses as much as digits as its factorization.

109215931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902633 (or 902622 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 31.

The square root of 109215931 is about 10450.6426118206. The cubic root of 109215931 is about 478.0008446966. Note that the first 3 decimals are identical.

The spelling of 109215931 in words is "one hundred nine million, two hundred fifteen thousand, nine hundred thirty-one".