51974781 has 8 divisors (see below), whose sum is σ = 70334304. Its totient is φ = 34132560.

The previous prime is 51974777. The next prime is 51974789. The reversal of 51974781 is 18747915.

51974781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 51974781 - 2² = 51974777 is a prime.

It is a super-2 number, since 2×51974781² = 5402755719995922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51974789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129090 + ... + 129491.

It is an arithmetic number, because the mean of its divisors is an integer number (8791788).

Almost surely, 2^51974781 is an apocalyptic number.

It is an amenable number.

51974781 is a deficient number, since it is larger than the sum of its proper divisors (18359523).

51974781 is a wasteful number, since it uses less digits than its factorization.

51974781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258651.

The product of its digits is 70560, while the sum is 42.

The square root of 51974781 is about 7209.3537158333. The cubic root of 51974781 is about 373.1907660535.

The spelling of 51974781 in words is "fifty-one million, nine hundred seventy-four thousand, seven hundred eighty-one".