51529921 has 8 divisors (see below), whose sum is σ = 52141320. Its totient is φ = 50921472.

The previous prime is 51529903. The next prime is 51529927. The reversal of 51529921 is 12992515.

It can be written as a sum of positive squares in 4 ways, for example, as 250000 + 51279921 = 500^2 + 7161^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 51529921 - 2¹¹ = 51527873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51529927) 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, 66625 + ... + 67393.

It is an arithmetic number, because the mean of its divisors is an integer number (6517665).

Almost surely, 2^51529921 is an apocalyptic number.

It is an amenable number.

51529921 is a deficient number, since it is larger than the sum of its proper divisors (611399).

51529921 is a wasteful number, since it uses less digits than its factorization.

51529921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1475.

The product of its digits is 8100, while the sum is 34.

The square root of 51529921 is about 7178.4344393468. The cubic root of 51529921 is about 372.1229817493.

The spelling of 51529921 in words is "fifty-one million, five hundred twenty-nine thousand, nine hundred twenty-one".