51630031 has 2 divisors, whose sum is σ = 51630032. Its totient is φ = 51630030.

The previous prime is 51630023. The next prime is 51630077. The reversal of 51630031 is 13003615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51630031 - 2³ = 51630023 is a prime.

It is a super-2 number, since 2×51630031² = 5331320202121922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51629990 and 51630008.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51630091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25815015 + 25815016.

It is an arithmetic number, because the mean of its divisors is an integer number (25815016).

Almost surely, 2^51630031 is an apocalyptic number.

51630031 is a deficient number, since it is larger than the sum of its proper divisors (1).

51630031 is an equidigital number, since it uses as much as digits as its factorization.

51630031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 51630031 is about 7185.4040248270. The cubic root of 51630031 is about 372.3638070947.

Adding to 51630031 its reverse (13003615), we get a palindrome (64633646).

The spelling of 51630031 in words is "fifty-one million, six hundred thirty thousand, thirty-one".