51012521 has 8 divisors (see below), whose sum is σ = 59288640. Its totient is φ = 42983568.

The previous prime is 51012517. The next prime is 51012581. The reversal of 51012521 is 12521015.

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 51012521 - 2² = 51012517 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51012521.

It is not an unprimeable number, because it can be changed into a prime (51012581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61346 + ... + 62171.

It is an arithmetic number, because the mean of its divisors is an integer number (7411080).

Almost surely, 2^51012521 is an apocalyptic number.

It is an amenable number.

51012521 is a deficient number, since it is larger than the sum of its proper divisors (8276119).

51012521 is a wasteful number, since it uses less digits than its factorization.

51012521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123583.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 51012521 is about 7142.3050200898. The cubic root of 51012521 is about 370.8733229722.

Adding to 51012521 its reverse (12521015), we get a palindrome (63533536).

It can be divided in two parts, 510 and 12521, that added together give a palindrome (13031).

The spelling of 51012521 in words is "fifty-one million, twelve thousand, five hundred twenty-one".