123020891 has 8 divisors (see below), whose sum is σ = 148865760. Its totient is φ = 99243648.

The previous prime is 123020881. The next prime is 123020903. The reversal of 123020891 is 198020321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 123020891 - 2¹⁴ = 123004507 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123020891.

It is not an unprimeable number, because it can be changed into a prime (123020851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 516776 + ... + 517013.

It is an arithmetic number, because the mean of its divisors is an integer number (18608220).

Almost surely, 2^123020891 is an apocalyptic number.

123020891 is a deficient number, since it is larger than the sum of its proper divisors (25844869).

123020891 is a wasteful number, since it uses less digits than its factorization.

123020891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1033813.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 123020891 is about 11091.4783054379. The cubic root of 123020891 is about 497.3471375348.

The spelling of 123020891 in words is "one hundred twenty-three million, twenty thousand, eight hundred ninety-one".