123213031 has 4 divisors (see below), whose sum is σ = 124433064. Its totient is φ = 121993000.

The previous prime is 123213019. The next prime is 123213037. The reversal of 123213031 is 130312321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123213031 - 2¹⁵ = 123180263 is a prime.

It is a super-2 number, since 2×123213031² = 30362902016413922, 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 = 123212996 and 123213014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123213037) 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, 609865 + ... + 610066.

It is an arithmetic number, because the mean of its divisors is an integer number (31108266).

Almost surely, 2^123213031 is an apocalyptic number.

123213031 is a deficient number, since it is larger than the sum of its proper divisors (1220033).

123213031 is a wasteful number, since it uses less digits than its factorization.

123213031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220032.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 123213031 is about 11100.1365306919. The cubic root of 123213031 is about 497.6059298183.

Adding to 123213031 its reverse (130312321), we get a palindrome (253525352).

The spelling of 123213031 in words is "one hundred twenty-three million, two hundred thirteen thousand, thirty-one".