51661324 has 48 divisors (see below), whose sum is σ = 109128096. Its totient is φ = 21081600.

The previous prime is 51661307. The next prime is 51661333. The reversal of 51661324 is 42316615.

It is a junction number, because it is equal to n+sod(n) for n = 51661292 and 51661301.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19944 + ... + 22384.

It is an arithmetic number, because the mean of its divisors is an integer number (2273502).

Almost surely, 2^51661324 is an apocalyptic number.

It is an amenable number.

51661324 is an abundant number, since it is smaller than the sum of its proper divisors (57466772).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51661324 is a wasteful number, since it uses less digits than its factorization.

51661324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2506 (or 2504 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 51661324 is about 7187.5812343235. The cubic root of 51661324 is about 372.4390218939.

Adding to 51661324 its reverse (42316615), we get a palindrome (93977939).

The spelling of 51661324 in words is "fifty-one million, six hundred sixty-one thousand, three hundred twenty-four".