1021482991 has 4 divisors (see below), whose sum is σ = 1023297912. Its totient is φ = 1019668072.

The previous prime is 1021482983. The next prime is 1021483009. The reversal of 1021482991 is 1992841201.

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

It is a cyclic number.

It is not a de Polignac number, because 1021482991 - 2³ = 1021482983 is a prime.

It is a super-3 number, since 3×1021482991³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021482991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021482901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 906616 + ... + 907741.

It is an arithmetic number, because the mean of its divisors is an integer number (255824478).

Almost surely, 2^1021482991 is an apocalyptic number.

1021482991 is a deficient number, since it is larger than the sum of its proper divisors (1814921).

1021482991 is an equidigital number, since it uses as much as digits as its factorization.

1021482991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1814920.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 1021482991 is about 31960.6475372449. The cubic root of 1021482991 is about 1007.1103205175.

The spelling of 1021482991 in words is "one billion, twenty-one million, four hundred eighty-two thousand, nine hundred ninety-one".