51761531 has 2 divisors, whose sum is σ = 51761532. Its totient is φ = 51761530.

The previous prime is 51761527. The next prime is 51761533. The reversal of 51761531 is 13516715.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51761531 - 2² = 51761527 is a prime.

It is a super-2 number, since 2×51761531² = 5358512182927922, which contains 22 as substring.

Together with 51761533, 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 = 51761494 and 51761503.

It is not a weakly prime, because it can be changed into another prime (51761533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25880765 + 25880766.

It is an arithmetic number, because the mean of its divisors is an integer number (25880766).

Almost surely, 2^51761531 is an apocalyptic number.

51761531 is the 3218-th centered decagonal number.

51761531 is a deficient number, since it is larger than the sum of its proper divisors (1).

51761531 is an equidigital number, since it uses as much as digits as its factorization.

51761531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3150, while the sum is 29.

The square root of 51761531 is about 7194.5487002313. The cubic root of 51761531 is about 372.6796718924.

The spelling of 51761531 in words is "fifty-one million, seven hundred sixty-one thousand, five hundred thirty-one".