51947493961 has 4 divisors (see below), whose sum is σ = 56669993424. Its totient is φ = 47224994500.

The previous prime is 51947493953. The next prime is 51947493967. The reversal of 51947493961 is 16939474915.

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 51947493961 - 2³ = 51947493953 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51947493896 and 51947493905.

It is not an unprimeable number, because it can be changed into a prime (51947493967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2361249715 + ... + 2361249736.

It is an arithmetic number, because the mean of its divisors is an integer number (14167498356).

Almost surely, 2^51947493961 is an apocalyptic number.

It is an amenable number.

51947493961 is a deficient number, since it is larger than the sum of its proper divisors (4722499463).

51947493961 is a wasteful number, since it uses less digits than its factorization.

51947493961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4722499462.

The product of its digits is 7348320, while the sum is 58.

The spelling of 51947493961 in words is "fifty-one billion, nine hundred forty-seven million, four hundred ninety-three thousand, nine hundred sixty-one".