51621417 has 24 divisors (see below), whose sum is σ = 78444288. Its totient is φ = 32666400.

The previous prime is 51621359. The next prime is 51621431. The reversal of 51621417 is 71412615.

It is a happy number.

51621417 is a `hidden beast` number, since 516 + 2 + 141 + 7 = 666.

51621417 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51621417 - 2⁸ = 51621161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51621217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13042 + ... + 16532.

It is an arithmetic number, because the mean of its divisors is an integer number (3268512).

Almost surely, 2^51621417 is an apocalyptic number.

It is an amenable number.

51621417 is a deficient number, since it is larger than the sum of its proper divisors (26822871).

51621417 is a wasteful number, since it uses less digits than its factorization.

51621417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3581 (or 3578 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 51621417 is about 7184.8045902446. The cubic root of 51621417 is about 372.3430974407.

The spelling of 51621417 in words is "fifty-one million, six hundred twenty-one thousand, four hundred seventeen".