1021311689 has 2 divisors, whose sum is σ = 1021311690. Its totient is φ = 1021311688.

The previous prime is 1021311677. The next prime is 1021311691. The reversal of 1021311689 is 9861131201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 568345600 + 452966089 = 23840^2 + 21283^2 .

It is an emirp because it is prime and its reverse (9861131201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1021311689 - 2⁸ = 1021311433 is a prime.

Together with 1021311691, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1021311649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510655844 + 510655845.

It is an arithmetic number, because the mean of its divisors is an integer number (510655845).

Almost surely, 2^1021311689 is an apocalyptic number.

It is an amenable number.

1021311689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021311689 is an equidigital number, since it uses as much as digits as its factorization.

1021311689 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 32.

The square root of 1021311689 is about 31957.9675354989. The cubic root of 1021311689 is about 1007.0540201325.

The spelling of 1021311689 in words is "one billion, twenty-one million, three hundred eleven thousand, six hundred eighty-nine".