1243332347391 has 6 divisors (see below), whose sum is σ = 1795924501800. Its totient is φ = 828888231588.

The previous prime is 1243332347353. The next prime is 1243332347399. The reversal of 1243332347391 is 1937432333421.

1243332347391 is a `hidden beast` number, since 1 + 2 + 43 + 33 + 23 + 473 + 91 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-1243332347391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243332347399) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69074019291 + ... + 69074019308.

It is an arithmetic number, because the mean of its divisors is an integer number (299320750300).

Almost surely, 2^{1243332347391} is an apocalyptic number.

1243332347391 is a deficient number, since it is larger than the sum of its proper divisors (552592154409).

1243332347391 is a wasteful number, since it uses less digits than its factorization.

1243332347391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138148038605 (or 138148038602 counting only the distinct ones).

The product of its digits is 979776, while the sum is 45.

The spelling of 1243332347391 in words is "one trillion, two hundred forty-three billion, three hundred thirty-two million, three hundred forty-seven thousand, three hundred ninety-one".