1239959434661 has 8 divisors (see below), whose sum is σ = 1276679604600. Its totient is φ = 1203408093888.

The previous prime is 1239959434633. The next prime is 1239959434669. The reversal of 1239959434661 is 1664349599321.

It can be written as a sum of positive squares in 4 ways, for example, as 570884513761 + 669074920900 = 755569^2 + 817970^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1239959434661 - 2¹⁴ = 1239959418277 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1239959434594 and 1239959434603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1239959434669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42192386 + ... + 42221763.

It is an arithmetic number, because the mean of its divisors is an integer number (159584950575).

Almost surely, 2^{1239959434661} is an apocalyptic number.

It is an amenable number.

1239959434661 is a deficient number, since it is larger than the sum of its proper divisors (36720169939).

1239959434661 is an equidigital number, since it uses as much as digits as its factorization.

1239959434661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84414583.

The product of its digits is 37791360, while the sum is 62.

The spelling of 1239959434661 in words is "one trillion, two hundred thirty-nine billion, nine hundred fifty-nine million, four hundred thirty-four thousand, six hundred sixty-one".