51115225 has 24 divisors (see below), whose sum is σ = 76255040. Its totient is φ = 33203520.

The previous prime is 51115199. The next prime is 51115231. The reversal of 51115225 is 52251115.

It is a happy number.

It is not a de Polignac number, because 51115225 - 2¹⁹ = 50590937 is a prime.

It is a super-2 number, since 2×51115225² = 5225532453601250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51115196 and 51115205.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4362 + ... + 11011.

Almost surely, 2^51115225 is an apocalyptic number.

It is an amenable number.

51115225 is a deficient number, since it is larger than the sum of its proper divisors (25139815).

51115225 is a wasteful number, since it uses less digits than its factorization.

51115225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15409 (or 15404 counting only the distinct ones).

The product of its digits is 500, while the sum is 22.

The square root of 51115225 is about 7149.4912406408. The cubic root of 51115225 is about 371.1220504031.

The spelling of 51115225 in words is "fifty-one million, one hundred fifteen thousand, two hundred twenty-five".