51621771 has 8 divisors (see below), whose sum is σ = 70689424. Its totient is φ = 33484320.

The previous prime is 51621763. The next prime is 51621781. The reversal of 51621771 is 17712615.

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

It is not a de Polignac number, because 51621771 - 2³ = 51621763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51621721) 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, 232420 + ... + 232641.

It is an arithmetic number, because the mean of its divisors is an integer number (8836178).

Almost surely, 2^51621771 is an apocalyptic number.

51621771 is a deficient number, since it is larger than the sum of its proper divisors (19067653).

51621771 is a wasteful number, since it uses less digits than its factorization.

51621771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465101.

The product of its digits is 2940, while the sum is 30.

The square root of 51621771 is about 7184.8292255279. The cubic root of 51621771 is about 372.3439485678.

The spelling of 51621771 in words is "fifty-one million, six hundred twenty-one thousand, seven hundred seventy-one".