191223923 has 12 divisors (see below), whose sum is σ = 221253480. Its totient is φ = 164688480.

The previous prime is 191223917. The next prime is 191223937. The reversal of 191223923 is 329322191.

191223923 = T₁₇₁₇ + T₁₇₁₈ + ... + T₁₈₃₇.

It is not a de Polignac number, because 191223923 - 2⁶ = 191223859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 191223923.

It is not an unprimeable number, because it can be changed into a prime (191223913) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39290 + ... + 43887.

It is an arithmetic number, because the mean of its divisors is an integer number (18437790).

Almost surely, 2^191223923 is an apocalyptic number.

191223923 is a deficient number, since it is larger than the sum of its proper divisors (30029557).

191223923 is a wasteful number, since it uses less digits than its factorization.

191223923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83218 (or 83207 counting only the distinct ones).

The product of its digits is 5832, while the sum is 32.

The square root of 191223923 is about 13828.3738378741. The cubic root of 191223923 is about 576.1214890907.

The spelling of 191223923 in words is "one hundred ninety-one million, two hundred twenty-three thousand, nine hundred twenty-three".