51551225 has 24 divisors (see below), whose sum is σ = 73843488. Its totient is φ = 35283200.

The previous prime is 51551221. The next prime is 51551243. The reversal of 51551225 is 52215515.

It is not a de Polignac number, because 51551225 - 2² = 51551221 is a prime.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51551194 and 51551203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51551221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 839 + ... + 10188.

It is an arithmetic number, because the mean of its divisors is an integer number (3076812).

Almost surely, 2^51551225 is an apocalyptic number.

51551225 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51551225 is a deficient number, since it is larger than the sum of its proper divisors (22292263).

51551225 is a wasteful number, since it uses less digits than its factorization.

51551225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11065 (or 11060 counting only the distinct ones).

The product of its digits is 2500, while the sum is 26.

The square root of 51551225 is about 7179.9181750212. The cubic root of 51551225 is about 372.1742569152.

The spelling of 51551225 in words is "fifty-one million, five hundred fifty-one thousand, two hundred twenty-five".