51189215 has 32 divisors (see below), whose sum is σ = 79073280. Its totient is φ = 30873600.

The previous prime is 51189209. The next prime is 51189217. The reversal of 51189215 is 51298115.

It is not a de Polignac number, because 51189215 - 2⁴ = 51189199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51189217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9791 + ... + 14079.

It is an arithmetic number, because the mean of its divisors is an integer number (2471040).

Almost surely, 2^51189215 is an apocalyptic number.

51189215 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51189215 is a deficient number, since it is larger than the sum of its proper divisors (27884065).

51189215 is a wasteful number, since it uses less digits than its factorization.

51189215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4343.

The product of its digits is 3600, while the sum is 32.

The square root of 51189215 is about 7154.6638635229. The cubic root of 51189215 is about 371.3010321833.

Subtracting 51189215 from its reverse (51298115), we obtain a square (108900 = 330²).

The spelling of 51189215 in words is "fifty-one million, one hundred eighty-nine thousand, two hundred fifteen".