1913123286649 has 9 divisors (see below), whose sum is σ = 1928482934661. Its totient is φ = 1897885045980.

The previous prime is 1913123286631. The next prime is 1913123286653. The reversal of 1913123286649 is 9466823213191.

The square root of 1913123286649 is 1383157.

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

It is a de Polignac number, because none of the positive numbers 2^k-1913123286649 is a prime.

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 1913123286649.

It is not an unprimeable number, because it can be changed into a prime (1913123286629) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 175655494 + ... + 175666384.

It is an arithmetic number, because the mean of its divisors is an integer number (214275881629).

Almost surely, 2^{1913123286649} is an apocalyptic number.

1913123286649 is the 1383157-th square number.

1913123286649 is the 691579-th centered octagonal number.

It is an amenable number.

1913123286649 is a deficient number, since it is larger than the sum of its proper divisors (15359648012).

1913123286649 is an frugal number, since it uses more digits than its factorization.

1913123286649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22036 (or 11018 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 55.

The spelling of 1913123286649 in words is "one trillion, nine hundred thirteen billion, one hundred twenty-three million, two hundred eighty-six thousand, six hundred forty-nine".