51521505001 has 4 divisors (see below), whose sum is σ = 51707503492. Its totient is φ = 51335506512.

The previous prime is 51521504999. The next prime is 51521505041. The reversal of 51521505001 is 10050512515.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11513504601 + 40008000400 = 107301^2 + 200020^2 .

It is a cyclic number.

It is not a de Polignac number, because 51521505001 - 2¹ = 51521504999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51521505041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92998830 + ... + 92999383.

It is an arithmetic number, because the mean of its divisors is an integer number (12926875873).

Almost surely, 2^51521505001 is an apocalyptic number.

It is an amenable number.

51521505001 is a deficient number, since it is larger than the sum of its proper divisors (185998491).

51521505001 is a wasteful number, since it uses less digits than its factorization.

51521505001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185998490.

The product of its (nonzero) digits is 1250, while the sum is 25.

The spelling of 51521505001 in words is "fifty-one billion, five hundred twenty-one million, five hundred five thousand, one".