51915869 has 2 divisors, whose sum is σ = 51915870. Its totient is φ = 51915868.

The previous prime is 51915859. The next prime is 51915883. The reversal of 51915869 is 96851915.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51912025 + 3844 = 7205^2 + 62^2 .

It is a cyclic number.

It is not a de Polignac number, because 51915869 - 2¹² = 51911773 is a prime.

It is a super-3 number, since 3×51915869³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51915859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25957934 + 25957935.

It is an arithmetic number, because the mean of its divisors is an integer number (25957935).

Almost surely, 2^51915869 is an apocalyptic number.

It is an amenable number.

51915869 is a deficient number, since it is larger than the sum of its proper divisors (1).

51915869 is an equidigital number, since it uses as much as digits as its factorization.

51915869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 97200, while the sum is 44.

The square root of 51915869 is about 7205.2667542569. The cubic root of 51915869 is about 373.0497122203.

The spelling of 51915869 in words is "fifty-one million, nine hundred fifteen thousand, eight hundred sixty-nine".