51521413 has 8 divisors (see below), whose sum is σ = 52239096. Its totient is φ = 50808000.

The previous prime is 51521401. The next prime is 51521423. The reversal of 51521413 is 31412515.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15737089 + 35784324 = 3967^2 + 5982^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51521413 - 2⁵ = 51521381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51521423) 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 7 ways as a sum of consecutive naturals, for example, 28723 + ... + 30463.

It is an arithmetic number, because the mean of its divisors is an integer number (6529887).

Almost surely, 2^51521413 is an apocalyptic number.

It is an amenable number.

51521413 is a deficient number, since it is larger than the sum of its proper divisors (717683).

51521413 is a wasteful number, since it uses less digits than its factorization.

51521413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135.

The product of its digits is 600, while the sum is 22.

The square root of 51521413 is about 7177.8418065600. The cubic root of 51521413 is about 372.1025004669.

Adding to 51521413 its reverse (31412515), we get a palindrome (82933928).

The spelling of 51521413 in words is "fifty-one million, five hundred twenty-one thousand, four hundred thirteen".