51447661 has 16 divisors (see below), whose sum is σ = 56222208. Its totient is φ = 46886400.

The previous prime is 51447659. The next prime is 51447667. The reversal of 51447661 is 16674415.

It is a cyclic number.

It is not a de Polignac number, because 51447661 - 2¹ = 51447659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51447667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155266 + ... + 155596.

It is an arithmetic number, because the mean of its divisors is an integer number (3513888).

Almost surely, 2^51447661 is an apocalyptic number.

It is an amenable number.

51447661 is a deficient number, since it is larger than the sum of its proper divisors (4774547).

51447661 is a wasteful number, since it uses less digits than its factorization.

51447661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612.

The product of its digits is 20160, while the sum is 34.

The square root of 51447661 is about 7172.7024892993. The cubic root of 51447661 is about 371.9248629417.

The spelling of 51447661 in words is "fifty-one million, four hundred forty-seven thousand, six hundred sixty-one".