123661031 has 8 divisors (see below), whose sum is σ = 135686880. Its totient is φ = 111994272.

The previous prime is 123660989. The next prime is 123661033. The reversal of 123661031 is 130166321.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 123661031 - 2²² = 119466727 is a prime.

It is a super-2 number, since 2×123661031² = 30584101175965922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123660988 and 123661006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123661033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89051 + ... + 90428.

It is an arithmetic number, because the mean of its divisors is an integer number (16960860).

Almost surely, 2^123661031 is an apocalyptic number.

123661031 is a deficient number, since it is larger than the sum of its proper divisors (12025849).

123661031 is a wasteful number, since it uses less digits than its factorization.

123661031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179545.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 123661031 is about 11120.2981524777. The cubic root of 123661031 is about 498.2082952572.

The spelling of 123661031 in words is "one hundred twenty-three million, six hundred sixty-one thousand, thirty-one".