51547661 has 8 divisors (see below), whose sum is σ = 56372448. Its totient is φ = 46746000.

The previous prime is 51547631. The next prime is 51547679. The reversal of 51547661 is 16674515.

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 51547661 - 2¹⁸ = 51285517 is a prime.

It is a super-2 number, since 2×51547661² = 5314322709141842, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51547631) 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, 935 + ... + 10196.

It is an arithmetic number, because the mean of its divisors is an integer number (7046556).

Almost surely, 2^51547661 is an apocalyptic number.

It is an amenable number.

51547661 is a deficient number, since it is larger than the sum of its proper divisors (4824787).

51547661 is a wasteful number, since it uses less digits than its factorization.

51547661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11563.

The product of its digits is 25200, while the sum is 35.

The square root of 51547661 is about 7179.6699784879. The cubic root of 51547661 is about 372.1656799472.

The spelling of 51547661 in words is "fifty-one million, five hundred forty-seven thousand, six hundred sixty-one".