51520311 has 6 divisors (see below), whose sum is σ = 74418240. Its totient is φ = 34346868.

The previous prime is 51520307. The next prime is 51520333. The reversal of 51520311 is 11302515.

It is not a de Polignac number, because 51520311 - 2² = 51520307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51520351) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2862231 + ... + 2862248.

It is an arithmetic number, because the mean of its divisors is an integer number (12403040).

Almost surely, 2^51520311 is an apocalyptic number.

51520311 is a deficient number, since it is larger than the sum of its proper divisors (22897929).

51520311 is a wasteful number, since it uses less digits than its factorization.

51520311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5724485 (or 5724482 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 51520311 is about 7177.7650421284. The cubic root of 51520311 is about 372.0998474608.

Adding to 51520311 its reverse (11302515), we get a palindrome (62822826).

The spelling of 51520311 in words is "fifty-one million, five hundred twenty thousand, three hundred eleven".