51016631 has 2 divisors, whose sum is σ = 51016632. Its totient is φ = 51016630.

The previous prime is 51016627. The next prime is 51016633. The reversal of 51016631 is 13661015.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51016631 - 2² = 51016627 is a prime.

It is a super-2 number, since 2×51016631² = 5205393277180322, which contains 22 as substring.

Together with 51016633, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 51016597 and 51016606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51016633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25508315 + 25508316.

It is an arithmetic number, because the mean of its divisors is an integer number (25508316).

Almost surely, 2^51016631 is an apocalyptic number.

51016631 is a deficient number, since it is larger than the sum of its proper divisors (1).

51016631 is an equidigital number, since it uses as much as digits as its factorization.

51016631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 51016631 is about 7142.5927365348. The cubic root of 51016631 is about 370.8832829349.

Adding to 51016631 its reverse (13661015), we get a palindrome (64677646).

The spelling of 51016631 in words is "fifty-one million, sixteen thousand, six hundred thirty-one".