51345121501 has 4 divisors (see below), whose sum is σ = 53577518112. Its totient is φ = 49112724892.

The previous prime is 51345121489. The next prime is 51345121511. The reversal of 51345121501 is 10512154315.

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 51345121501 - 2¹⁷ = 51344990429 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51345121501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51345121511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1116198271 + ... + 1116198316.

It is an arithmetic number, because the mean of its divisors is an integer number (13394379528).

Almost surely, 2^51345121501 is an apocalyptic number.

It is an amenable number.

51345121501 is a deficient number, since it is larger than the sum of its proper divisors (2232396611).

51345121501 is a wasteful number, since it uses less digits than its factorization.

51345121501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2232396610.

The product of its (nonzero) digits is 3000, while the sum is 28.

Adding to 51345121501 its reverse (10512154315), we get a palindrome (61857275816).

The spelling of 51345121501 in words is "fifty-one billion, three hundred forty-five million, one hundred twenty-one thousand, five hundred one".