51147321 has 8 divisors (see below), whose sum is σ = 68963040. Its totient is φ = 33714912.

The previous prime is 51147319. The next prime is 51147323. The reversal of 51147321 is 12374115.

It is an interprime number because it is at equal distance from previous prime (51147319) and next prime (51147323).

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

It is not a de Polignac number, because 51147321 - 2¹ = 51147319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51147291 and 51147300.

It is not an unprimeable number, because it can be changed into a prime (51147323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95515 + ... + 96048.

It is an arithmetic number, because the mean of its divisors is an integer number (8620380).

Almost surely, 2^51147321 is an apocalyptic number.

It is an amenable number.

51147321 is a deficient number, since it is larger than the sum of its proper divisors (17815719).

51147321 is a wasteful number, since it uses less digits than its factorization.

51147321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191655.

The product of its digits is 840, while the sum is 24.

The square root of 51147321 is about 7151.7355236334. The cubic root of 51147321 is about 371.1997118113.

The spelling of 51147321 in words is "fifty-one million, one hundred forty-seven thousand, three hundred twenty-one".