109215863 has 4 divisors (see below), whose sum is σ = 110236680. Its totient is φ = 108195048.

The previous prime is 109215859. The next prime is 109215893. The reversal of 109215863 is 368512901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 368512901 = 13309 ⋅27689.

It is a cyclic number.

It is not a de Polignac number, because 109215863 - 2² = 109215859 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 (109215893) 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 3 ways as a sum of consecutive naturals, for example, 510248 + ... + 510461.

It is an arithmetic number, because the mean of its divisors is an integer number (27559170).

Almost surely, 2^109215863 is an apocalyptic number.

109215863 is a deficient number, since it is larger than the sum of its proper divisors (1020817).

109215863 is a wasteful number, since it uses less digits than its factorization.

109215863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1020816.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 109215863 is about 10450.6393584316. The cubic root of 109215863 is about 478.0007454923. Note that the first 3 decimals are identical.

The spelling of 109215863 in words is "one hundred nine million, two hundred fifteen thousand, eight hundred sixty-three".