51172661 has 8 divisors (see below), whose sum is σ = 53230848. Its totient is φ = 49140000.

The previous prime is 51172621. The next prime is 51172663. The reversal of 51172661 is 16627115.

51172661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51172661 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 (51172663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2240 + ... + 10361.

It is an arithmetic number, because the mean of its divisors is an integer number (6653856).

Almost surely, 2^51172661 is an apocalyptic number.

It is an amenable number.

51172661 is a deficient number, since it is larger than the sum of its proper divisors (2058187).

51172661 is a wasteful number, since it uses less digits than its factorization.

51172661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12763.

The product of its digits is 2520, while the sum is 29.

The square root of 51172661 is about 7153.5069022124. The cubic root of 51172661 is about 371.2610030485.

Adding to 51172661 its reverse (16627115), we get a palindrome (67799776).

The spelling of 51172661 in words is "fifty-one million, one hundred seventy-two thousand, six hundred sixty-one".