51975439 has 2 divisors, whose sum is σ = 51975440. Its totient is φ = 51975438.

The previous prime is 51975403. The next prime is 51975461. The reversal of 51975439 is 93457915.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51975439 - 2¹³ = 51967247 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51975395 and 51975404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51975739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25987719 + 25987720.

It is an arithmetic number, because the mean of its divisors is an integer number (25987720).

Almost surely, 2^51975439 is an apocalyptic number.

51975439 is a deficient number, since it is larger than the sum of its proper divisors (1).

51975439 is an equidigital number, since it uses as much as digits as its factorization.

51975439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 170100, while the sum is 43.

The square root of 51975439 is about 7209.3993508475. The cubic root of 51975439 is about 373.1923409101.

The spelling of 51975439 in words is "fifty-one million, nine hundred seventy-five thousand, four hundred thirty-nine".