51464621 has 4 divisors (see below), whose sum is σ = 55423452. Its totient is φ = 47505792.

The previous prime is 51464603. The next prime is 51464641. The reversal of 51464621 is 12646415.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12888100 + 38576521 = 3590^2 + 6211^2 .

It is a cyclic number.

It is not a de Polignac number, because 51464621 - 2¹⁰ = 51463597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51464641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1979396 + ... + 1979421.

It is an arithmetic number, because the mean of its divisors is an integer number (13855863).

Almost surely, 2^51464621 is an apocalyptic number.

It is an amenable number.

51464621 is a deficient number, since it is larger than the sum of its proper divisors (3958831).

51464621 is a wasteful number, since it uses less digits than its factorization.

51464621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3958830.

The product of its digits is 5760, while the sum is 29.

The square root of 51464621 is about 7173.8846519860. The cubic root of 51464621 is about 371.9657274665.

The spelling of 51464621 in words is "fifty-one million, four hundred sixty-four thousand, six hundred twenty-one".