51561501 has 8 divisors (see below), whose sum is σ = 68783520. Its totient is φ = 34356912.

The previous prime is 51561479. The next prime is 51561511. The reversal of 51561501 is 10516515.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51561501 - 2⁷ = 51561373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51561511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6211 + ... + 11903.

It is an arithmetic number, because the mean of its divisors is an integer number (8597940).

Almost surely, 2^51561501 is an apocalyptic number.

It is an amenable number.

51561501 is a deficient number, since it is larger than the sum of its proper divisors (17222019).

51561501 is a wasteful number, since it uses less digits than its factorization.

51561501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8715.

The product of its (nonzero) digits is 750, while the sum is 24.

The square root of 51561501 is about 7180.6337464043. The cubic root of 51561501 is about 372.1989844787.

The spelling of 51561501 in words is "fifty-one million, five hundred sixty-one thousand, five hundred one".