51553947 has 8 divisors (see below), whose sum is σ = 70337344. Its totient is φ = 33569928.

The previous prime is 51553937. The next prime is 51553963. The reversal of 51553947 is 74935515.

51553947 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 51553947 - 2²² = 47359643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51553907) 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, 199693 + ... + 199950.

It is an arithmetic number, because the mean of its divisors is an integer number (8792168).

Almost surely, 2^51553947 is an apocalyptic number.

51553947 is a deficient number, since it is larger than the sum of its proper divisors (18783397).

51553947 is a wasteful number, since it uses less digits than its factorization.

51553947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399689.

The product of its digits is 94500, while the sum is 39.

The square root of 51553947 is about 7180.1077289968. The cubic root of 51553947 is about 372.1808072962.

The spelling of 51553947 in words is "fifty-one million, five hundred fifty-three thousand, nine hundred forty-seven".