1243780332001 has 9 divisors (see below), whose sum is σ = 1250540535153. Its totient is φ = 1237056495780.

The previous prime is 1243780331987. The next prime is 1243780332007. The reversal of 1243780332001 is 1002330873421.

The square root of 1243780332001 is 1115249.

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

It is not a de Polignac number, because 1243780332001 - 2²⁷ = 1243646114273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243780332007) 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, 213009640 + ... + 213015478.

Almost surely, 2^{1243780332001} is an apocalyptic number.

1243780332001 is the 1115249-th square number.

1243780332001 is the 557625-th centered octagonal number.

It is an amenable number.

1243780332001 is a deficient number, since it is larger than the sum of its proper divisors (6760203152).

1243780332001 is an frugal number, since it uses more digits than its factorization.

1243780332001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12060 (or 6030 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 34.

The spelling of 1243780332001 in words is "one trillion, two hundred forty-three billion, seven hundred eighty million, three hundred thirty-two thousand, one".