51071621 has 8 divisors (see below), whose sum is σ = 54884160. Its totient is φ = 47348928.

The previous prime is 51071617. The next prime is 51071627. The reversal of 51071621 is 12617015.

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 51071621 - 2² = 51071617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51071627) 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, 21281 + ... + 23558.

It is an arithmetic number, because the mean of its divisors is an integer number (6860520).

Almost surely, 2^51071621 is an apocalyptic number.

It is an amenable number.

51071621 is a deficient number, since it is larger than the sum of its proper divisors (3812539).

51071621 is a wasteful number, since it uses less digits than its factorization.

51071621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44923.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 51071621 is about 7146.4411422749. The cubic root of 51071621 is about 371.0164914459.

Adding to 51071621 its reverse (12617015), we get a palindrome (63688636).

The spelling of 51071621 in words is "fifty-one million, seventy-one thousand, six hundred twenty-one".