51671839 has 2 divisors, whose sum is σ = 51671840. Its totient is φ = 51671838.

The previous prime is 51671831. The next prime is 51671911. The reversal of 51671839 is 93817615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51671839 - 2³ = 51671831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51671831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25835919 + 25835920.

It is an arithmetic number, because the mean of its divisors is an integer number (25835920).

Almost surely, 2^51671839 is an apocalyptic number.

51671839 is a deficient number, since it is larger than the sum of its proper divisors (1).

51671839 is an equidigital number, since it uses as much as digits as its factorization.

51671839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 40.

The square root of 51671839 is about 7188.3126671007. The cubic root of 51671839 is about 372.4642885753.

The spelling of 51671839 in words is "fifty-one million, six hundred seventy-one thousand, eight hundred thirty-nine".