51520219 has 2 divisors, whose sum is σ = 51520220. Its totient is φ = 51520218.

The previous prime is 51520199. The next prime is 51520247. The reversal of 51520219 is 91202515.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51520219 - 2²³ = 43131611 is a prime.

It is a super-2 number, since 2×51520219² = 5308665931615922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51520193 and 51520202.

It is not a weakly prime, because it can be changed into another prime (51526219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25760109 + 25760110.

It is an arithmetic number, because the mean of its divisors is an integer number (25760110).

Almost surely, 2^51520219 is an apocalyptic number.

51520219 is a deficient number, since it is larger than the sum of its proper divisors (1).

51520219 is an equidigital number, since it uses as much as digits as its factorization.

51520219 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 51520219 is about 7177.7586334454. The cubic root of 51520219 is about 372.0996259740.

The spelling of 51520219 in words is "fifty-one million, five hundred twenty thousand, two hundred nineteen".