51521205 has 16 divisors (see below), whose sum is σ = 84662784. Its totient is φ = 26735040.

The previous prime is 51521201. The next prime is 51521209. The reversal of 51521205 is 50212515.

It is an interprime number because it is at equal distance from previous prime (51521201) and next prime (51521209).

It is not a de Polignac number, because 51521205 - 2² = 51521201 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51521201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45861 + ... + 46970.

It is an arithmetic number, because the mean of its divisors is an integer number (5291424).

Almost surely, 2^51521205 is an apocalyptic number.

It is an amenable number.

51521205 is a deficient number, since it is larger than the sum of its proper divisors (33141579).

51521205 is a wasteful number, since it uses less digits than its factorization.

51521205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92876.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 51521205 is about 7177.8273175105. The cubic root of 51521205 is about 372.1019997209.

The spelling of 51521205 in words is "fifty-one million, five hundred twenty-one thousand, two hundred five".