123091506 has 12 divisors (see below), whose sum is σ = 266698302. Its totient is φ = 41030496.

The previous prime is 123091487. The next prime is 123091511. The reversal of 123091506 is 605190321.

It can be written as a sum of positive squares in only one way, i.e., 123010281 + 81225 = 11091^2 + 285^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 123091506.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3419191 + ... + 3419226.

Almost surely, 2^123091506 is an apocalyptic number.

123091506 is an abundant number, since it is smaller than the sum of its proper divisors (143606796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123091506 is a wasteful number, since it uses less digits than its factorization.

123091506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6838425 (or 6838422 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 123091506 is about 11094.6611484984. The cubic root of 123091506 is about 497.4422797778.

The spelling of 123091506 in words is "one hundred twenty-three million, ninety-one thousand, five hundred six".