51211223 has 12 divisors (see below), whose sum is σ = 60246720. Its totient is φ = 43398432.

The previous prime is 51211217. The next prime is 51211231. The reversal of 51211223 is 32211215.

It is a happy number.

It is not a de Polignac number, because 51211223 - 2⁶ = 51211159 is a prime.

It is a super-2 number, since 2×51211223² = 5245178722311458, 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 (51211253) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1511 + ... + 10232.

It is an arithmetic number, because the mean of its divisors is an integer number (5020560).

Almost surely, 2^51211223 is an apocalyptic number.

51211223 is a deficient number, since it is larger than the sum of its proper divisors (9035497).

51211223 is a wasteful number, since it uses less digits than its factorization.

51211223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11846 (or 11839 counting only the distinct ones).

The product of its digits is 120, while the sum is 17.

The square root of 51211223 is about 7156.2017159943. The cubic root of 51211223 is about 371.3542362441.

Adding to 51211223 its reverse (32211215), we get a palindrome (83422438).

The spelling of 51211223 in words is "fifty-one million, two hundred eleven thousand, two hundred twenty-three".