123312251 has 4 divisors (see below), whose sum is σ = 124140000. Its totient is φ = 122484504.

The previous prime is 123312199. The next prime is 123312253. The reversal of 123312251 is 152213321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 152213321 = 13 ⋅11708717.

It is a cyclic number.

It is not a de Polignac number, because 123312251 - 2¹⁴ = 123295867 is a prime.

It is a super-2 number, since 2×123312251² = 30411822493374002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123312253) 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, 413651 + ... + 413948.

It is an arithmetic number, because the mean of its divisors is an integer number (31035000).

Almost surely, 2^123312251 is an apocalyptic number.

123312251 is a deficient number, since it is larger than the sum of its proper divisors (827749).

123312251 is an equidigital number, since it uses as much as digits as its factorization.

123312251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827748.

The product of its digits is 360, while the sum is 20.

The square root of 123312251 is about 11104.6049456971. The cubic root of 123312251 is about 497.7394633500.

Adding to 123312251 its reverse (152213321), we get a palindrome (275525572).

The spelling of 123312251 in words is "one hundred twenty-three million, three hundred twelve thousand, two hundred fifty-one".