51989513 has 2 divisors, whose sum is σ = 51989514. Its totient is φ = 51989512.

The previous prime is 51989503. The next prime is 51989533. The reversal of 51989513 is 31598915.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50580544 + 1408969 = 7112^2 + 1187^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51989513 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51989503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25994756 + 25994757.

It is an arithmetic number, because the mean of its divisors is an integer number (25994757).

Almost surely, 2^51989513 is an apocalyptic number.

It is an amenable number.

51989513 is a deficient number, since it is larger than the sum of its proper divisors (1).

51989513 is an equidigital number, since it uses as much as digits as its factorization.

51989513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48600, while the sum is 41.

The square root of 51989513 is about 7210.3753716433. The cubic root of 51989513 is about 373.2260224278.

The spelling of 51989513 in words is "fifty-one million, nine hundred eighty-nine thousand, five hundred thirteen".