1200001331 has 2 divisors, whose sum is σ = 1200001332. Its totient is φ = 1200001330.

The previous prime is 1200001303. The next prime is 1200001337. The reversal of 1200001331 is 1331000021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1200001331 - 2⁶ = 1200001267 is a prime.

It is a super-2 number, since 2×1200001331² = 2880006388803543122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1200001337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600000665 + 600000666.

It is an arithmetic number, because the mean of its divisors is an integer number (600000666).

Almost surely, 2^1200001331 is an apocalyptic number.

1200001331 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200001331 is an equidigital number, since it uses as much as digits as its factorization.

1200001331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 1200001331 is about 34641.0353627024. The cubic root of 1200001331 is about 1062.6589620710.

Adding to 1200001331 its reverse (1331000021), we get a palindrome (2531001352).

The spelling of 1200001331 in words is "one billion, two hundred million, one thousand, three hundred thirty-one".