1002662861 has 4 divisors (see below), whose sum is σ = 1002728412. Its totient is φ = 1002597312.

The previous prime is 1002662833. The next prime is 1002662879. The reversal of 1002662861 is 1682662001.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 539121961 + 463540900 = 23219^2 + 21530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1002662861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002662561) 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 in 3 ways as a sum of consecutive naturals, for example, 3701 + ... + 44933.

It is an arithmetic number, because the mean of its divisors is an integer number (250682103).

Almost surely, 2^1002662861 is an apocalyptic number.

It is an amenable number.

1002662861 is a deficient number, since it is larger than the sum of its proper divisors (65551).

1002662861 is an equidigital number, since it uses as much as digits as its factorization.

1002662861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65550.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 1002662861 is about 31664.8521392411. The cubic root of 1002662861 is about 1000.8868336270.

The spelling of 1002662861 in words is "one billion, two million, six hundred sixty-two thousand, eight hundred sixty-one".