52451721 has 48 divisors (see below), whose sum is σ = 90574848. Its totient is φ = 28620000.

The previous prime is 52451719. The next prime is 52451743. The reversal of 52451721 is 12715425.

It is not a de Polignac number, because 52451721 - 2¹ = 52451719 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (52451921) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 208846 + ... + 209096.

It is an arithmetic number, because the mean of its divisors is an integer number (1886976).

Almost surely, 2^52451721 is an apocalyptic number.

It is an amenable number.

52451721 is a deficient number, since it is larger than the sum of its proper divisors (38123127).

52451721 is a wasteful number, since it uses less digits than its factorization.

52451721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402 (or 399 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 52451721 is about 7242.3560393010. The cubic root of 52451721 is about 374.3288047084.

The spelling of 52451721 in words is "fifty-two million, four hundred fifty-one thousand, seven hundred twenty-one".