51384869 has 2 divisors, whose sum is σ = 51384870. Its totient is φ = 51384868.

The previous prime is 51384859. The next prime is 51384917. The reversal of 51384869 is 96848315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34656769 + 16728100 = 5887^2 + 4090^2 .

It is a cyclic number.

It is not a de Polignac number, because 51384869 - 2²⁴ = 34607653 is a prime.

It is a super-2 number, since 2×51384869² = 5280809524294322, 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 (51384859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25692434 + 25692435.

It is an arithmetic number, because the mean of its divisors is an integer number (25692435).

Almost surely, 2^51384869 is an apocalyptic number.

It is an amenable number.

51384869 is a deficient number, since it is larger than the sum of its proper divisors (1).

51384869 is an equidigital number, since it uses as much as digits as its factorization.

51384869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 44.

The square root of 51384869 is about 7168.3240021640. The cubic root of 51384869 is about 371.7734895967.

The spelling of 51384869 in words is "fifty-one million, three hundred eighty-four thousand, eight hundred sixty-nine".