51945219 has 10 divisors (see below), whose sum is σ = 77597300. Its totient is φ = 34630092.

The previous prime is 51945191. The next prime is 51945241. The reversal of 51945219 is 91254915.

It is not a de Polignac number, because 51945219 - 2¹³ = 51937027 is a prime.

It is a super-2 number, since 2×51945219² = 5396611553915922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51943219) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 320569 + ... + 320730.

It is an arithmetic number, because the mean of its divisors is an integer number (7759730).

Almost surely, 2^51945219 is an apocalyptic number.

51945219 is a deficient number, since it is larger than the sum of its proper divisors (25652081).

51945219 is an equidigital number, since it uses as much as digits as its factorization.

51945219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641311 (or 641302 counting only the distinct ones).

The product of its digits is 16200, while the sum is 36.

The square root of 51945219 is about 7207.3031710897. The cubic root of 51945219 is about 373.1199986704.

The spelling of 51945219 in words is "fifty-one million, nine hundred forty-five thousand, two hundred nineteen".