51631611 has 4 divisors (see below), whose sum is σ = 68842152. Its totient is φ = 34421072.

The previous prime is 51631609. The next prime is 51631627. The reversal of 51631611 is 11613615.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51631611 - 2¹ = 51631609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51631651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8605266 + ... + 8605271.

It is an arithmetic number, because the mean of its divisors is an integer number (17210538).

Almost surely, 2^51631611 is an apocalyptic number.

51631611 is a deficient number, since it is larger than the sum of its proper divisors (17210541).

51631611 is a wasteful number, since it uses less digits than its factorization.

51631611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17210540.

The product of its digits is 540, while the sum is 24.

The square root of 51631611 is about 7185.5139690909. The cubic root of 51631611 is about 372.3676054578.

The spelling of 51631611 in words is "fifty-one million, six hundred thirty-one thousand, six hundred eleven".