51520141 has 4 divisors (see below), whose sum is σ = 51573852. Its totient is φ = 51466432.

The previous prime is 51520129. The next prime is 51520151. The reversal of 51520141 is 14102515.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31753225 + 19766916 = 5635^2 + 4446^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51520141 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 (51520121) 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, 25390 + ... + 27343.

It is an arithmetic number, because the mean of its divisors is an integer number (12893463).

Almost surely, 2^51520141 is an apocalyptic number.

It is an amenable number.

51520141 is a deficient number, since it is larger than the sum of its proper divisors (53711).

51520141 is an equidigital number, since it uses as much as digits as its factorization.

51520141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53710.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 51520141 is about 7177.7531999923. The cubic root of 51520141 is about 372.0994381915.

Adding to 51520141 its reverse (14102515), we get a palindrome (65622656).

The spelling of 51520141 in words is "fifty-one million, five hundred twenty thousand, one hundred forty-one".