1020239384761 has 3 divisors (see below), whose sum is σ = 1020240394831. Its totient is φ = 1020238374692.

The previous prime is 1020239384707. The next prime is 1020239384839. The reversal of 1020239384761 is 1674839320201.

The square root of 1020239384761 is 1010069.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 759914936361 + 260324448400 = 871731^2 + 510220^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1020239384761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020239384861) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 505035 + ... + 1515103.

Almost surely, 2^{1020239384761} is an apocalyptic number.

1020239384761 is the 1010069-th square number.

1020239384761 is the 505035-th centered octagonal number.

It is an amenable number.

1020239384761 is a deficient number, since it is larger than the sum of its proper divisors (1010070).

1020239384761 is an frugal number, since it uses more digits than its factorization.

1020239384761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2020138 (or 1010069 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 46.

The spelling of 1020239384761 in words is "one trillion, twenty billion, two hundred thirty-nine million, three hundred eighty-four thousand, seven hundred sixty-one".