51252921 has 6 divisors (see below), whose sum is σ = 74032010. Its totient is φ = 34168608.

The previous prime is 51252919. The next prime is 51252973. The reversal of 51252921 is 12925215.

51252921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 44156025 + 7096896 = 6645^2 + 2664^2 .

It is not a de Polignac number, because 51252921 - 2¹ = 51252919 is a prime.

It is a super-2 number, since 2×51252921² = 5253723822064482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51252991) 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 5 ways as a sum of consecutive naturals, for example, 2847376 + ... + 2847393.

Almost surely, 2^51252921 is an apocalyptic number.

It is an amenable number.

51252921 is a deficient number, since it is larger than the sum of its proper divisors (22779089).

51252921 is a wasteful number, since it uses less digits than its factorization.

51252921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5694775 (or 5694772 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 51252921 is about 7159.1145402207. The cubic root of 51252921 is about 371.4549988452.

The spelling of 51252921 in words is "fifty-one million, two hundred fifty-two thousand, nine hundred twenty-one".