1121781586613 has 4 divisors (see below), whose sum is σ = 1122164842560. Its totient is φ = 1121398330668.

The previous prime is 1121781586609. The next prime is 1121781586619. The reversal of 1121781586613 is 3166851871211.

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 1121781586613 - 2² = 1121781586609 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121781586619) 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, 191623583 + ... + 191629436.

It is an arithmetic number, because the mean of its divisors is an integer number (280541210640).

Almost surely, 2^{1121781586613} is an apocalyptic number.

It is an amenable number.

1121781586613 is a deficient number, since it is larger than the sum of its proper divisors (383255947).

1121781586613 is an equidigital number, since it uses as much as digits as its factorization.

1121781586613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383255946.

The product of its digits is 483840, while the sum is 50.

The spelling of 1121781586613 in words is "one trillion, one hundred twenty-one billion, seven hundred eighty-one million, five hundred eighty-six thousand, six hundred thirteen".