1331207747 has 4 divisors (see below), whose sum is σ = 1331280720. Its totient is φ = 1331134776.

The previous prime is 1331207711. The next prime is 1331207767. The reversal of 1331207747 is 7477021331.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1331207747 - 2¹² = 1331203651 is a prime.

It is a super-2 number, since 2×1331207747² = 3544228131345632018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331207707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18029 + ... + 54657.

It is an arithmetic number, because the mean of its divisors is an integer number (332820180).

Almost surely, 2^1331207747 is an apocalyptic number.

1331207747 is a deficient number, since it is larger than the sum of its proper divisors (72973).

1331207747 is an equidigital number, since it uses as much as digits as its factorization.

1331207747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72972.

The product of its (nonzero) digits is 24696, while the sum is 35.

The square root of 1331207747 is about 36485.7197681504. The cubic root of 1331207747 is about 1100.0572276012.

The spelling of 1331207747 in words is "one billion, three hundred thirty-one million, two hundred seven thousand, seven hundred forty-seven".