1243523837956 has 9 divisors (see below), whose sum is σ = 2176170619399. Its totient is φ = 621760803844.

The previous prime is 1243523837939. The next prime is 1243523837971. The reversal of 1243523837956 is 6597383253421.

The square root of 1243523837956 is 1115134.

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

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 1243523837956.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1951485 + ... + 2509051.

Almost surely, 2^{1243523837956} is an apocalyptic number.

1243523837956 is the 1115134-th square number.

It is an amenable number.

1243523837956 is a deficient number, since it is larger than the sum of its proper divisors (932646781443).

1243523837956 is an frugal number, since it uses more digits than its factorization.

1243523837956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115138 (or 557569 counting only the distinct ones).

The product of its digits is 32659200, while the sum is 58.

The spelling of 1243523837956 in words is "one trillion, two hundred forty-three billion, five hundred twenty-three million, eight hundred thirty-seven thousand, nine hundred fifty-six".