51521463 has 24 divisors (see below), whose sum is σ = 85857408. Its totient is φ = 29161872.

The previous prime is 51521443. The next prime is 51521467. The reversal of 51521463 is 36412515.

51521463 is a `hidden beast` number, since 515 + 2 + 146 + 3 = 666.

It is not a de Polignac number, because 51521463 - 2⁶ = 51521399 is a prime.

It is a super-2 number, since 2×51521463² = 5308922299320738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51521467) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2920 + ... + 10562.

It is an arithmetic number, because the mean of its divisors is an integer number (3577392).

Almost surely, 2^51521463 is an apocalyptic number.

51521463 is a deficient number, since it is larger than the sum of its proper divisors (34335945).

51521463 is a wasteful number, since it uses less digits than its factorization.

51521463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7763 (or 7760 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 51521463 is about 7177.8452895002. The cubic root of 51521463 is about 372.1026208383.

Adding to 51521463 its reverse (36412515), we get a palindrome (87933978).

It can be divided in two parts, 51521 and 463, that added together give a square (51984 = 228²).

The spelling of 51521463 in words is "fifty-one million, five hundred twenty-one thousand, four hundred sixty-three".