51131225461 has 4 divisors (see below), whose sum is σ = 51297776992. Its totient is φ = 50964673932.

The previous prime is 51131225449. The next prime is 51131225479. The reversal of 51131225461 is 16452213115.

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 51131225461 - 2¹¹ = 51131223413 is a prime.

It is a super-2 number, since 2×51131225461² (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 (51131225161) 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, 83275305 + ... + 83275918.

It is an arithmetic number, because the mean of its divisors is an integer number (12824444248).

Almost surely, 2^51131225461 is an apocalyptic number.

It is an amenable number.

51131225461 is a deficient number, since it is larger than the sum of its proper divisors (166551531).

51131225461 is a wasteful number, since it uses less digits than its factorization.

51131225461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166551530.

The product of its digits is 7200, while the sum is 31.

Adding to 51131225461 its reverse (16452213115), we get a palindrome (67583438576).

The spelling of 51131225461 in words is "fifty-one billion, one hundred thirty-one million, two hundred twenty-five thousand, four hundred sixty-one".