51521013 has 12 divisors (see below), whose sum is σ = 74719008. Its totient is φ = 34209000.

The previous prime is 51520981. The next prime is 51521017. The reversal of 51521013 is 31012515.

51521013 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 51521013 - 2⁵ = 51520981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51521017) 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 11 ways as a sum of consecutive naturals, for example, 9145 + ... + 13662.

It is an arithmetic number, because the mean of its divisors is an integer number (6226584).

Almost surely, 2^51521013 is an apocalyptic number.

It is an amenable number.

51521013 is a deficient number, since it is larger than the sum of its proper divisors (23197995).

51521013 is a wasteful number, since it uses less digits than its factorization.

51521013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23064 (or 23061 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 51521013 is about 7177.8139429773. The cubic root of 51521013 is about 372.1015374926.

Adding to 51521013 its reverse (31012515), we get a palindrome (82533528).

It can be divided in two parts, 515 and 21013, that added together give a triangular number (21528 = T₂₀₇).

The spelling of 51521013 in words is "fifty-one million, five hundred twenty-one thousand, thirteen".