51007661 has 8 divisors (see below), whose sum is σ = 51554880. Its totient is φ = 50463712.

The previous prime is 51007657. The next prime is 51007669. The reversal of 51007661 is 16670015.

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 51007661 - 2² = 51007657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51007661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51007669) 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, 41096 + ... + 42318.

It is an arithmetic number, because the mean of its divisors is an integer number (6444360).

Almost surely, 2^51007661 is an apocalyptic number.

It is an amenable number.

51007661 is a deficient number, since it is larger than the sum of its proper divisors (547219).

51007661 is a wasteful number, since it uses less digits than its factorization.

51007661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1635.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 51007661 is about 7141.9647856875. The cubic root of 51007661 is about 370.8615448077.

Adding to 51007661 its reverse (16670015), we get a palindrome (67677676).

It can be divided in two parts, 5 and 1007661, that multiplied together give a palindrome (5038305).

The spelling of 51007661 in words is "fifty-one million, seven thousand, six hundred sixty-one".