2002661291 has 2 divisors, whose sum is σ = 2002661292. Its totient is φ = 2002661290.

The previous prime is 2002661261. The next prime is 2002661299. The reversal of 2002661291 is 1921662002.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2002661291 - 2¹⁴ = 2002644907 is a prime.

It is not a weakly prime, because it can be changed into another prime (2002661299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1001330645 + 1001330646.

It is an arithmetic number, because the mean of its divisors is an integer number (1001330646).

Almost surely, 2^2002661291 is an apocalyptic number.

2002661291 is a deficient number, since it is larger than the sum of its proper divisors (1).

2002661291 is an equidigital number, since it uses as much as digits as its factorization.

2002661291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 2002661291 is about 44751.1037964428. The cubic root of 2002661291 is about 1260.4796382988.

The spelling of 2002661291 in words is "two billion, two million, six hundred sixty-one thousand, two hundred ninety-one".