51663441 has 4 divisors (see below), whose sum is σ = 68884592. Its totient is φ = 34442292.

The previous prime is 51663439. The next prime is 51663449. The reversal of 51663441 is 14436615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 51663441 - 2¹ = 51663439 is a prime.

It is a super-2 number, since 2×51663441² = 5338222271920962, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51663399 and 51663408.

It is not an unprimeable number, because it can be changed into a prime (51663449) 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, 8610571 + ... + 8610576.

It is an arithmetic number, because the mean of its divisors is an integer number (17221148).

Almost surely, 2^51663441 is an apocalyptic number.

It is an amenable number.

51663441 is a deficient number, since it is larger than the sum of its proper divisors (17221151).

51663441 is a wasteful number, since it uses less digits than its factorization.

51663441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17221150.

The product of its digits is 8640, while the sum is 30.

The square root of 51663441 is about 7187.7285007156. The cubic root of 51663441 is about 372.4441091467. Note that the first 3 decimals are identical.

The spelling of 51663441 in words is "fifty-one million, six hundred sixty-three thousand, four hundred forty-one".