51529213 has 4 divisors (see below), whose sum is σ = 52060540. Its totient is φ = 50997888.

The previous prime is 51529199. The next prime is 51529217. The reversal of 51529213 is 31292515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31292515 = 5 ⋅6258503.

It can be written as a sum of positive squares in 2 ways, for example, as 25130169 + 26399044 = 5013^2 + 5138^2 .

It is a cyclic number.

It is not a de Polignac number, because 51529213 - 2¹³ = 51521021 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 (51529217) 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, 265518 + ... + 265711.

It is an arithmetic number, because the mean of its divisors is an integer number (13015135).

Almost surely, 2^51529213 is an apocalyptic number.

It is an amenable number.

51529213 is a deficient number, since it is larger than the sum of its proper divisors (531327).

51529213 is an equidigital number, since it uses as much as digits as its factorization.

51529213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531326.

The product of its digits is 2700, while the sum is 28.

The square root of 51529213 is about 7178.3851248035. The cubic root of 51529213 is about 372.1212774691.

It can be divided in two parts, 5152 and 9213, that added together give a triangular number (14365 = T₁₆₉).

The spelling of 51529213 in words is "fifty-one million, five hundred twenty-nine thousand, two hundred thirteen".