1247331881 has 2 divisors, whose sum is σ = 1247331882. Its totient is φ = 1247331880.

The previous prime is 1247331859. The next prime is 1247331907. The reversal of 1247331881 is 1881337421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1177107481 + 70224400 = 34309^2 + 8380^2 .

It is a cyclic number.

It is not a de Polignac number, because 1247331881 - 2¹⁸ = 1247069737 is a prime.

It is a super-2 number, since 2×1247331881² = 3111673642717996322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1247331821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623665940 + 623665941.

It is an arithmetic number, because the mean of its divisors is an integer number (623665941).

Almost surely, 2^1247331881 is an apocalyptic number.

It is an amenable number.

1247331881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247331881 is an equidigital number, since it uses as much as digits as its factorization.

1247331881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 38.

The square root of 1247331881 is about 35317.5860018773. The cubic root of 1247331881 is about 1076.4503606312.

The spelling of 1247331881 in words is "one billion, two hundred forty-seven million, three hundred thirty-one thousand, eight hundred eighty-one".