51971357 has 2 divisors, whose sum is σ = 51971358. Its totient is φ = 51971356.

The previous prime is 51971351. The next prime is 51971369. The reversal of 51971357 is 75317915.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46158436 + 5812921 = 6794^2 + 2411^2 .

It is a cyclic number.

It is not a de Polignac number, because 51971357 - 2⁴ = 51971341 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51971357.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51971351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25985678 + 25985679.

It is an arithmetic number, because the mean of its divisors is an integer number (25985679).

Almost surely, 2^51971357 is an apocalyptic number.

It is an amenable number.

51971357 is a deficient number, since it is larger than the sum of its proper divisors (1).

51971357 is an equidigital number, since it uses as much as digits as its factorization.

51971357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33075, while the sum is 38.

The square root of 51971357 is about 7209.1162426472. The cubic root of 51971357 is about 373.1825708402.

The spelling of 51971357 in words is "fifty-one million, nine hundred seventy-one thousand, three hundred fifty-seven".