51120010261 has 4 divisors (see below), whose sum is σ = 51121828800. Its totient is φ = 51118191724.

The previous prime is 51120010247. The next prime is 51120010273. The reversal of 51120010261 is 16201002115.

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.

It is a cyclic number.

It is not a de Polignac number, because 51120010261 - 2²⁹ = 50583139349 is a prime.

It is a super-2 number, since 2×51120010261² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51120010211) 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, 866431 + ... + 923548.

It is an arithmetic number, because the mean of its divisors is an integer number (12780457200).

Almost surely, 2^51120010261 is an apocalyptic number.

It is an amenable number.

51120010261 is a deficient number, since it is larger than the sum of its proper divisors (1818539).

51120010261 is a wasteful number, since it uses less digits than its factorization.

51120010261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1818538.

The product of its (nonzero) digits is 120, while the sum is 19.

Adding to 51120010261 its reverse (16201002115), we get a palindrome (67321012376).

The spelling of 51120010261 in words is "fifty-one billion, one hundred twenty million, ten thousand, two hundred sixty-one".