123012031 has 4 divisors (see below), whose sum is σ = 123043752. Its totient is φ = 122980312.

The previous prime is 123011971. The next prime is 123012037. The reversal of 123012031 is 130210321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130210321 = 43 ⋅3028147.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123012031 is a prime.

It is a super-2 number, since 2×123012031² = 30263919541489922, 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 (123012037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9076 + ... + 18121.

It is an arithmetic number, because the mean of its divisors is an integer number (30760938).

Almost surely, 2^123012031 is an apocalyptic number.

123012031 is a deficient number, since it is larger than the sum of its proper divisors (31721).

123012031 is an equidigital number, since it uses as much as digits as its factorization.

123012031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31720.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 123012031 is about 11091.0788925154. The cubic root of 123012031 is about 497.3351975535.

Adding to 123012031 its reverse (130210321), we get a palindrome (253222352).

The spelling of 123012031 in words is "one hundred twenty-three million, twelve thousand, thirty-one".