51313219 has 2 divisors, whose sum is σ = 51313220. Its totient is φ = 51313218.

The previous prime is 51313201. The next prime is 51313231. The reversal of 51313219 is 91231315.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51313219 - 2⁹ = 51312707 is a prime.

It is a super-2 number, since 2×51313219² = 5266092888283922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51313193 and 51313202.

It is not a weakly prime, because it can be changed into another prime (51313289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25656609 + 25656610.

It is an arithmetic number, because the mean of its divisors is an integer number (25656610).

Almost surely, 2^51313219 is an apocalyptic number.

51313219 is a deficient number, since it is larger than the sum of its proper divisors (1).

51313219 is an equidigital number, since it uses as much as digits as its factorization.

51313219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 810, while the sum is 25.

The square root of 51313219 is about 7163.3245773174. The cubic root of 51313219 is about 371.6006114609.

The spelling of 51313219 in words is "fifty-one million, three hundred thirteen thousand, two hundred nineteen".