51278469 has 12 divisors (see below), whose sum is σ = 75152448. Its totient is φ = 31077640.

The previous prime is 51278453. The next prime is 51278527. The reversal of 51278469 is 96487215.

It is not a de Polignac number, because 51278469 - 2⁴ = 51278453 is a prime.

It is a super-2 number, since 2×51278469² = 5258962765967922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51278469.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51278449) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70269 + ... + 70994.

It is an arithmetic number, because the mean of its divisors is an integer number (6262704).

Almost surely, 2^51278469 is an apocalyptic number.

It is an amenable number.

51278469 is a deficient number, since it is larger than the sum of its proper divisors (23873979).

51278469 is a wasteful number, since it uses less digits than its factorization.

51278469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141288 (or 141277 counting only the distinct ones).

The product of its digits is 120960, while the sum is 42.

The square root of 51278469 is about 7160.8986167938. The cubic root of 51278469 is about 371.5167082122.

The spelling of 51278469 in words is "fifty-one million, two hundred seventy-eight thousand, four hundred sixty-nine".