51670439 has 2 divisors, whose sum is σ = 51670440. Its totient is φ = 51670438.

The previous prime is 51670417. The next prime is 51670447. The reversal of 51670439 is 93407615.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51670439 - 2⁸ = 51670183 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 51670399 and 51670408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51678439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25835219 + 25835220.

It is an arithmetic number, because the mean of its divisors is an integer number (25835220).

Almost surely, 2^51670439 is an apocalyptic number.

51670439 is a deficient number, since it is larger than the sum of its proper divisors (1).

51670439 is an equidigital number, since it uses as much as digits as its factorization.

51670439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 51670439 is about 7188.2152861472. The cubic root of 51670439 is about 372.4609246881.

The spelling of 51670439 in words is "fifty-one million, six hundred seventy thousand, four hundred thirty-nine".