123551213 has 4 divisors (see below), whose sum is σ = 127536768. Its totient is φ = 119565660.

The previous prime is 123551201. The next prime is 123551221. The reversal of 123551213 is 312155321.

It is a happy number.

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 123551213 - 2¹² = 123547117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123551293) 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 3 ways as a sum of consecutive naturals, for example, 1992731 + ... + 1992792.

It is an arithmetic number, because the mean of its divisors is an integer number (31884192).

Almost surely, 2^123551213 is an apocalyptic number.

It is an amenable number.

123551213 is a deficient number, since it is larger than the sum of its proper divisors (3985555).

123551213 is an equidigital number, since it uses as much as digits as its factorization.

123551213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3985554.

The product of its digits is 900, while the sum is 23.

The square root of 123551213 is about 11115.3593284248. The cubic root of 123551213 is about 498.0607725171.

The spelling of 123551213 in words is "one hundred twenty-three million, five hundred fifty-one thousand, two hundred thirteen".