51621671 has 2 divisors, whose sum is σ = 51621672. Its totient is φ = 51621670.

The previous prime is 51621659. The next prime is 51621709. The reversal of 51621671 is 17612615.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51621671 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51621071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25810835 + 25810836.

It is an arithmetic number, because the mean of its divisors is an integer number (25810836).

Almost surely, 2^51621671 is an apocalyptic number.

51621671 is a deficient number, since it is larger than the sum of its proper divisors (1).

51621671 is an equidigital number, since it uses as much as digits as its factorization.

51621671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 29.

The square root of 51621671 is about 7184.8222664169. The cubic root of 51621671 is about 372.3437081368.

The spelling of 51621671 in words is "fifty-one million, six hundred twenty-one thousand, six hundred seventy-one".