51445213 has 24 divisors (see below), whose sum is σ = 58340736. Its totient is φ = 45175680.

The previous prime is 51445193. The next prime is 51445223. The reversal of 51445213 is 31254415.

It is a happy number.

It is not a de Polignac number, because 51445213 - 2¹³ = 51437021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51445223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 767806 + ... + 767872.

It is an arithmetic number, because the mean of its divisors is an integer number (2430864).

Almost surely, 2^51445213 is an apocalyptic number.

It is an amenable number.

51445213 is a deficient number, since it is larger than the sum of its proper divisors (6895523).

51445213 is a wasteful number, since it uses less digits than its factorization.

51445213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193 (or 162 counting only the distinct ones).

The product of its digits is 2400, while the sum is 25.

The square root of 51445213 is about 7172.5318402918. The cubic root of 51445213 is about 371.9189638299.

Adding to 51445213 its reverse (31254415), we get a palindrome (82699628).

The spelling of 51445213 in words is "fifty-one million, four hundred forty-five thousand, two hundred thirteen".