51947619 has 8 divisors (see below), whose sum is σ = 69301440. Its totient is φ = 34612776.

The previous prime is 51947591. The next prime is 51947641. The reversal of 51947619 is 91674915.

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

It is not a de Polignac number, because 51947619 - 2⁵ = 51947587 is a prime.

It is a super-2 number, since 2×51947619² = 5397110239538322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51947669) 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 7 ways as a sum of consecutive naturals, for example, 3892 + ... + 10910.

It is an arithmetic number, because the mean of its divisors is an integer number (8662680).

Almost surely, 2^51947619 is an apocalyptic number.

51947619 is a deficient number, since it is larger than the sum of its proper divisors (17353821).

51947619 is a wasteful number, since it uses less digits than its factorization.

51947619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9489.

The product of its digits is 68040, while the sum is 42.

The square root of 51947619 is about 7207.4696669497. The cubic root of 51947619 is about 373.1257449432.

The spelling of 51947619 in words is "fifty-one million, nine hundred forty-seven thousand, six hundred nineteen".