51663409 has 8 divisors (see below), whose sum is σ = 60045120. Its totient is φ = 43532016.

The previous prime is 51663407. The next prime is 51663427. The reversal of 51663409 is 90436615.

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 51663409 - 2¹ = 51663407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51663407) 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, 62134 + ... + 62959.

It is an arithmetic number, because the mean of its divisors is an integer number (7505640).

Almost surely, 2^51663409 is an apocalyptic number.

51663409 is a gapful number since it is divisible by the number (59) formed by its first and last digit.

It is an amenable number.

51663409 is a deficient number, since it is larger than the sum of its proper divisors (8381711).

51663409 is a wasteful number, since it uses less digits than its factorization.

51663409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125159.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 51663409 is about 7187.7262746991. The cubic root of 51663409 is about 372.4440322502. Note that the first 3 decimals are identical.

The spelling of 51663409 in words is "fifty-one million, six hundred sixty-three thousand, four hundred nine".