1331029961 has 2 divisors, whose sum is σ = 1331029962. Its totient is φ = 1331029960.

The previous prime is 1331029901. The next prime is 1331029993. The reversal of 1331029961 is 1699201331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 698809225 + 632220736 = 26435^2 + 25144^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331029961 - 2¹⁸ = 1330767817 is a prime.

It is not a weakly prime, because it can be changed into another prime (1331029901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665514980 + 665514981.

It is an arithmetic number, because the mean of its divisors is an integer number (665514981).

Almost surely, 2^1331029961 is an apocalyptic number.

It is an amenable number.

1331029961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331029961 is an equidigital number, since it uses as much as digits as its factorization.

1331029961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 1331029961 is about 36483.2833089348. The cubic root of 1331029961 is about 1100.0082536571.

The spelling of 1331029961 in words is "one billion, three hundred thirty-one million, twenty-nine thousand, nine hundred sixty-one".