51020069 has 2 divisors, whose sum is σ = 51020070. Its totient is φ = 51020068.

The previous prime is 51020063. The next prime is 51020083. The reversal of 51020069 is 96002015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29052100 + 21967969 = 5390^2 + 4687^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51020069 is a prime.

It is a super-2 number, since 2×51020069² = 5206094881529522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51020063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25510034 + 25510035.

It is an arithmetic number, because the mean of its divisors is an integer number (25510035).

Almost surely, 2^51020069 is an apocalyptic number.

It is an amenable number.

51020069 is a deficient number, since it is larger than the sum of its proper divisors (1).

51020069 is an equidigital number, since it uses as much as digits as its factorization.

51020069 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 51020069 is about 7142.8334013891. The cubic root of 51020069 is about 370.8916139965.

It can be divided in two parts, 5102006 and 9, that added together give a palindrome (5102015).

The spelling of 51020069 in words is "fifty-one million, twenty thousand, sixty-nine".