505831028749 has 12 divisors (see below), whose sum is σ = 543699005724. Its totient is φ = 468970575744.

The previous prime is 505831028723. The next prime is 505831028779. The reversal of 505831028749 is 947820138505.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 336266613225 + 169564415524 = 579885^2 + 411782^2 .

It is not a de Polignac number, because 505831028749 - 2³⁷ = 368392075277 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 505831028696 and 505831028705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505831028779) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3237874 + ... + 3390499.

It is an arithmetic number, because the mean of its divisors is an integer number (45308250477).

Almost surely, 2^505831028749 is an apocalyptic number.

It is an amenable number.

505831028749 is a deficient number, since it is larger than the sum of its proper divisors (37867976975).

505831028749 is an equidigital number, since it uses as much as digits as its factorization.

505831028749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6628524 (or 6628457 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 52.

The spelling of 505831028749 in words is "five hundred five billion, eight hundred thirty-one million, twenty-eight thousand, seven hundred forty-nine".