51246561 has 4 divisors (see below), whose sum is σ = 68328752. Its totient is φ = 34164372.

The previous prime is 51246557. The next prime is 51246563. The reversal of 51246561 is 16564215.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 51246561 - 2² = 51246557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51246563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8541091 + ... + 8541096.

It is an arithmetic number, because the mean of its divisors is an integer number (17082188).

Almost surely, 2^51246561 is an apocalyptic number.

It is an amenable number.

51246561 is a deficient number, since it is larger than the sum of its proper divisors (17082191).

51246561 is a wasteful number, since it uses less digits than its factorization.

51246561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17082190.

The product of its digits is 7200, while the sum is 30.

The square root of 51246561 is about 7158.6703374300. The cubic root of 51246561 is about 371.4396335322.

The spelling of 51246561 in words is "fifty-one million, two hundred forty-six thousand, five hundred sixty-one".