1331231071 has 2 divisors, whose sum is σ = 1331231072. Its totient is φ = 1331231070.

The previous prime is 1331231059. The next prime is 1331231081. The reversal of 1331231071 is 1701321331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1331231071 - 2¹¹ = 1331229023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331231081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665615535 + 665615536.

It is an arithmetic number, because the mean of its divisors is an integer number (665615536).

Almost surely, 2^1331231071 is an apocalyptic number.

1331231071 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331231071 is an equidigital number, since it uses as much as digits as its factorization.

1331231071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 1331231071 is about 36486.0393986522. The cubic root of 1331231071 is about 1100.0636522395.

The spelling of 1331231071 in words is "one billion, three hundred thirty-one million, two hundred thirty-one thousand, seventy-one".