51111225 has 72 divisors (see below), whose sum is σ = 101323872. Its totient is φ = 24422400.

The previous prime is 51111217. The next prime is 51111227. The reversal of 51111225 is 52211115.

It is not a de Polignac number, because 51111225 - 2³ = 51111217 is a prime.

It is a super-2 number, since 2×51111225² = 5224714642001250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51111198 and 51111207.

It is not an unprimeable number, because it can be changed into a prime (51111227) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 264729 + ... + 264921.

It is an arithmetic number, because the mean of its divisors is an integer number (1407276).

Almost surely, 2^51111225 is an apocalyptic number.

51111225 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51111225 is a deficient number, since it is larger than the sum of its proper divisors (50212647).

51111225 is a wasteful number, since it uses less digits than its factorization.

51111225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327 (or 319 counting only the distinct ones).

The product of its digits is 100, while the sum is 18.

The square root of 51111225 is about 7149.2114949832. The cubic root of 51111225 is about 371.1123694850.

It can be divided in two parts, 5111 and 1225, that added together give a palindrome (6336).

The spelling of 51111225 in words is "fifty-one million, one hundred eleven thousand, two hundred twenty-five".