51021475 has 24 divisors (see below), whose sum is σ = 66826080. Its totient is φ = 38565120.

The previous prime is 51021473. The next prime is 51021491. The reversal of 51021475 is 57412015.

It is not a de Polignac number, because 51021475 - 2¹ = 51021473 is a prime.

It is a super-2 number, since 2×51021475² = 5206381822351250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (51021473) 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 23 ways as a sum of consecutive naturals, for example, 50677 + ... + 51673.

It is an arithmetic number, because the mean of its divisors is an integer number (2784420).

Almost surely, 2^51021475 is an apocalyptic number.

51021475 is a deficient number, since it is larger than the sum of its proper divisors (15804605).

51021475 is a wasteful number, since it uses less digits than its factorization.

51021475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1119 (or 1114 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 51021475 is about 7142.9318210382. The cubic root of 51021475 is about 370.8950209488.

The spelling of 51021475 in words is "fifty-one million, twenty-one thousand, four hundred seventy-five".