51403921 has 8 divisors (see below), whose sum is σ = 54892800. Its totient is φ = 48029520.

The previous prime is 51403909. The next prime is 51403931. The reversal of 51403921 is 12930415.

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 51403921 - 2¹¹ = 51401873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51403931) 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, 27691 + ... + 29488.

It is an arithmetic number, because the mean of its divisors is an integer number (6861600).

Almost surely, 2^51403921 is an apocalyptic number.

It is an amenable number.

51403921 is a deficient number, since it is larger than the sum of its proper divisors (3488879).

51403921 is a wasteful number, since it uses less digits than its factorization.

51403921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57239.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 51403921 is about 7169.6527809930. The cubic root of 51403921 is about 371.8194314822.

The spelling of 51403921 in words is "fifty-one million, four hundred three thousand, nine hundred twenty-one".