1243149181156 has 9 divisors (see below), whose sum is σ = 2175514969411. Its totient is φ = 621573475612.

The previous prime is 1243149181133. The next prime is 1243149181189. The reversal of 1243149181156 is 6511819413421.

The square root of 1243149181156 is 1114966.

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

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1951191 + ... + 2508673.

Almost surely, 2^{1243149181156} is an apocalyptic number.

1243149181156 is the 1114966-th square number.

It is an amenable number.

1243149181156 is a deficient number, since it is larger than the sum of its proper divisors (932365788255).

1243149181156 is an frugal number, since it uses more digits than its factorization.

1243149181156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1114970 (or 557485 counting only the distinct ones).

The product of its digits is 207360, while the sum is 46.

The spelling of 1243149181156 in words is "one trillion, two hundred forty-three billion, one hundred forty-nine million, one hundred eighty-one thousand, one hundred fifty-six".