123991597 has 4 divisors (see below), whose sum is σ = 129382560. Its totient is φ = 118600636.

The previous prime is 123991579. The next prime is 123991601. The reversal of 123991597 is 795199321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 123991597 - 2²³ = 115602989 is a prime.

It is a super-2 number, since 2×123991597² = 30747832253220818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123991547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2695447 + ... + 2695492.

It is an arithmetic number, because the mean of its divisors is an integer number (32345640).

Almost surely, 2^123991597 is an apocalyptic number.

It is an amenable number.

123991597 is a deficient number, since it is larger than the sum of its proper divisors (5390963).

123991597 is an equidigital number, since it uses as much as digits as its factorization.

123991597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5390962.

The product of its digits is 153090, while the sum is 46.

The square root of 123991597 is about 11135.1514134295. The cubic root of 123991597 is about 498.6518308135.

The spelling of 123991597 in words is "one hundred twenty-three million, nine hundred ninety-one thousand, five hundred ninety-seven".