51100225 has 12 divisors (see below), whose sum is σ = 69125040. Its totient is φ = 37163600.

The previous prime is 51100213. The next prime is 51100229. The reversal of 51100225 is 52200115.

It is not a de Polignac number, because 51100225 - 2¹⁹ = 50575937 is a prime.

It is a super-2 number, since 2×51100225² = 5222465990101250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51100199 and 51100208.

It is not an unprimeable number, because it can be changed into a prime (51100229) 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, 92635 + ... + 93184.

It is an arithmetic number, because the mean of its divisors is an integer number (5760420).

Almost surely, 2^51100225 is an apocalyptic number.

51100225 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51100225 is a deficient number, since it is larger than the sum of its proper divisors (18024815).

51100225 is a wasteful number, since it uses less digits than its factorization.

51100225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185840 (or 185835 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 51100225 is about 7148.4421379766. The cubic root of 51100225 is about 371.0857443555.

The spelling of 51100225 in words is "fifty-one million, one hundred thousand, two hundred twenty-five".