51971530 has 16 divisors (see below), whose sum is σ = 100745064. Its totient is φ = 19189440.

The previous prime is 51971501. The next prime is 51971537. The reversal of 51971530 is 3517915.

It can be written as a sum of positive squares in 4 ways, for example, as 38303721 + 13667809 = 6189^2 + 3697^2 .

It is a super-3 number, since 3×51971530³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51971492 and 51971501.

It is not an unprimeable number, because it can be changed into a prime (51971537) 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 in 7 ways as a sum of consecutive naturals, for example, 199761 + ... + 200020.

Almost surely, 2^51971530 is an apocalyptic number.

51971530 is a deficient number, since it is larger than the sum of its proper divisors (48773534).

51971530 is a wasteful number, since it uses less digits than its factorization.

51971530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399801.

The product of its (nonzero) digits is 4725, while the sum is 31.

The square root of 51971530 is about 7209.1282413340. The cubic root of 51971530 is about 373.1829849177.

The spelling of 51971530 in words is "fifty-one million, nine hundred seventy-one thousand, five hundred thirty".