1331974247 has 2 divisors, whose sum is σ = 1331974248. Its totient is φ = 1331974246.

The previous prime is 1331974187. The next prime is 1331974261. The reversal of 1331974247 is 7424791331.

It is a strong prime.

It is an emirp because it is prime and its reverse (7424791331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1331974247 - 2²⁰ = 1330925671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331974277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665987123 + 665987124.

It is an arithmetic number, because the mean of its divisors is an integer number (665987124).

Almost surely, 2^1331974247 is an apocalyptic number.

1331974247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331974247 is an equidigital number, since it uses as much as digits as its factorization.

1331974247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 41.

The square root of 1331974247 is about 36496.2223661573. Note that the first 3 decimals coincide. The cubic root of 1331974247 is about 1100.2683221464.

The spelling of 1331974247 in words is "one billion, three hundred thirty-one million, nine hundred seventy-four thousand, two hundred forty-seven".