123213591 has 12 divisors (see below), whose sum is σ = 178483968. Its totient is φ = 81907584.

The previous prime is 123213551. The next prime is 123213593. The reversal of 123213591 is 195312321.

It is not a de Polignac number, because 123213591 - 2¹⁰ = 123212567 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123213593) 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, 16215 + ... + 22568.

It is an arithmetic number, because the mean of its divisors is an integer number (14873664).

Almost surely, 2^123213591 is an apocalyptic number.

123213591 is a deficient number, since it is larger than the sum of its proper divisors (55270377).

123213591 is a wasteful number, since it uses less digits than its factorization.

123213591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39142 (or 39139 counting only the distinct ones).

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

The square root of 123213591 is about 11100.1617555782. The cubic root of 123213591 is about 497.6066836858.

The spelling of 123213591 in words is "one hundred twenty-three million, two hundred thirteen thousand, five hundred ninety-one".