1021311982 has 4 divisors (see below), whose sum is σ = 1531967976. Its totient is φ = 510655990.

The previous prime is 1021311947. The next prime is 1021311983. The reversal of 1021311982 is 2891131201.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1021311982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021311983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255327994 + ... + 255327997.

It is an arithmetic number, because the mean of its divisors is an integer number (382991994).

Almost surely, 2^1021311982 is an apocalyptic number.

1021311982 is a deficient number, since it is larger than the sum of its proper divisors (510655994).

1021311982 is an equidigital number, since it uses as much as digits as its factorization.

1021311982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510655993.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 1021311982 is about 31957.9721196449. The cubic root of 1021311982 is about 1007.0541164357.

The spelling of 1021311982 in words is "one billion, twenty-one million, three hundred eleven thousand, nine hundred eighty-two".