51152213 has 4 divisors (see below), whose sum is σ = 58459680. Its totient is φ = 43844748.

The previous prime is 51152197. The next prime is 51152243. The reversal of 51152213 is 31225115.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31225115 = 5 ⋅6245023.

It is a cyclic number.

It is not a de Polignac number, because 51152213 - 2⁴ = 51152197 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 (51152243) 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 3 ways as a sum of consecutive naturals, for example, 3653723 + ... + 3653736.

It is an arithmetic number, because the mean of its divisors is an integer number (14614920).

Almost surely, 2^51152213 is an apocalyptic number.

It is an amenable number.

51152213 is a deficient number, since it is larger than the sum of its proper divisors (7307467).

51152213 is an equidigital number, since it uses as much as digits as its factorization.

51152213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7307466.

The product of its digits is 300, while the sum is 20.

The square root of 51152213 is about 7152.0775303404. The cubic root of 51152213 is about 371.2115459345.

Adding to 51152213 its reverse (31225115), we get a palindrome (82377328).

The spelling of 51152213 in words is "fifty-one million, one hundred fifty-two thousand, two hundred thirteen".