51403521 has 8 divisors (see below), whose sum is σ = 73810240. Its totient is φ = 31632912.

The previous prime is 51403519. The next prime is 51403537. The reversal of 51403521 is 12530415.

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

It is not a de Polignac number, because 51403521 - 2¹ = 51403519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51403511) 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, 658981 + ... + 659058.

It is an arithmetic number, because the mean of its divisors is an integer number (9226280).

Almost surely, 2^51403521 is an apocalyptic number.

It is an amenable number.

51403521 is a deficient number, since it is larger than the sum of its proper divisors (22406719).

51403521 is a wasteful number, since it uses less digits than its factorization.

51403521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1318055.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 51403521 is about 7169.6248855850. The cubic root of 51403521 is about 371.8184670412.

Adding to 51403521 its reverse (12530415), we get a palindrome (63933936).

The spelling of 51403521 in words is "fifty-one million, four hundred three thousand, five hundred twenty-one".