51161478 has 8 divisors (see below), whose sum is σ = 102322968. Its totient is φ = 17053824.

The previous prime is 51161459. The next prime is 51161479. The reversal of 51161478 is 87416115.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

51161478 is an admirable number.

It is a super-2 number, since 2×51161478² = 5234993662288968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51161479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4263451 + ... + 4263462.

It is an arithmetic number, because the mean of its divisors is an integer number (12790371).

Almost surely, 2^51161478 is an apocalyptic number.

51161478 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51161478 is a wasteful number, since it uses less digits than its factorization.

51161478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8526918.

The product of its digits is 6720, while the sum is 33.

The square root of 51161478 is about 7152.7252149093. The cubic root of 51161478 is about 371.2339566126.

The spelling of 51161478 in words is "fifty-one million, one hundred sixty-one thousand, four hundred seventy-eight".