123520091 has 4 divisors (see below), whose sum is σ = 124793592. Its totient is φ = 122246592.

The previous prime is 123520063. The next prime is 123520093. The reversal of 123520091 is 190025321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123520091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123520093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 636605 + ... + 636798.

It is an arithmetic number, because the mean of its divisors is an integer number (31198398).

Almost surely, 2^123520091 is an apocalyptic number.

123520091 is a deficient number, since it is larger than the sum of its proper divisors (1273501).

123520091 is an equidigital number, since it uses as much as digits as its factorization.

123520091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1273500.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 123520091 is about 11113.9592855112. The cubic root of 123520091 is about 498.0189492421.

The spelling of 123520091 in words is "one hundred twenty-three million, five hundred twenty thousand, ninety-one".