51021417 has 4 divisors (see below), whose sum is σ = 68028560. Its totient is φ = 34014276.

The previous prime is 51021413. The next prime is 51021419. The reversal of 51021417 is 71412015.

It is a happy number.

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 51021417 - 2² = 51021413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51021393 and 51021402.

It is not an unprimeable number, because it can be changed into a prime (51021413) 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 3 ways as a sum of consecutive naturals, for example, 8503567 + ... + 8503572.

It is an arithmetic number, because the mean of its divisors is an integer number (17007140).

Almost surely, 2^51021417 is an apocalyptic number.

It is an amenable number.

51021417 is a deficient number, since it is larger than the sum of its proper divisors (17007143).

51021417 is a wasteful number, since it uses less digits than its factorization.

51021417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17007142.

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 51021417 is about 7142.9277610795. The cubic root of 51021417 is about 370.8948804072.

The spelling of 51021417 in words is "fifty-one million, twenty-one thousand, four hundred seventeen".