51511693 has 2 divisors, whose sum is σ = 51511694. Its totient is φ = 51511692.

The previous prime is 51511657. The next prime is 51511741. The reversal of 51511693 is 39611515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39212644 + 12299049 = 6262^2 + 3507^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51511693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51511643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25755846 + 25755847.

It is an arithmetic number, because the mean of its divisors is an integer number (25755847).

Almost surely, 2^51511693 is an apocalyptic number.

It is an amenable number.

51511693 is a deficient number, since it is larger than the sum of its proper divisors (1).

51511693 is an equidigital number, since it uses as much as digits as its factorization.

51511693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4050, while the sum is 31.

The square root of 51511693 is about 7177.1646908790. The cubic root of 51511693 is about 372.0790987810.

The spelling of 51511693 in words is "fifty-one million, five hundred eleven thousand, six hundred ninety-three".