123742091 has 4 divisors (see below), whose sum is σ = 134991384. Its totient is φ = 112492800.

The previous prime is 123742063. The next prime is 123742103. The reversal of 123742091 is 190247321.

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

It is a cyclic number.

It is not a de Polignac number, because 123742091 - 2¹⁸ = 123479947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123742051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5624630 + ... + 5624651.

It is an arithmetic number, because the mean of its divisors is an integer number (33747846).

Almost surely, 2^123742091 is an apocalyptic number.

123742091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

123742091 is a deficient number, since it is larger than the sum of its proper divisors (11249293).

123742091 is a wasteful number, since it uses less digits than its factorization.

123742091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11249292.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 123742091 is about 11123.9422418493. The cubic root of 123742091 is about 498.3171302535.

The spelling of 123742091 in words is "one hundred twenty-three million, seven hundred forty-two thousand, ninety-one".