50991283729 has 4 divisors (see below), whose sum is σ = 51953383476. Its totient is φ = 50029183984.

The previous prime is 50991283621. The next prime is 50991283939. The reversal of 50991283729 is 92738219905.

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 30234254400 + 20757029329 = 173880^2 + 144073^2 .

It is a cyclic number.

It is not a de Polignac number, because 50991283729 - 2⁷ = 50991283601 is a prime.

It is a super-2 number, since 2×50991283729² (a number of 22 digits) contains 22 as substring.

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 50991283729.

It is not an unprimeable number, because it can be changed into a prime (50991283229) 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, 481049794 + ... + 481049899.

It is an arithmetic number, because the mean of its divisors is an integer number (12988345869).

Almost surely, 2^50991283729 is an apocalyptic number.

It is an amenable number.

50991283729 is a deficient number, since it is larger than the sum of its proper divisors (962099747).

50991283729 is an equidigital number, since it uses as much as digits as its factorization.

50991283729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962099746.

The product of its (nonzero) digits is 2449440, while the sum is 55.

The spelling of 50991283729 in words is "fifty billion, nine hundred ninety-one million, two hundred eighty-three thousand, seven hundred twenty-nine".