1021441439 has 4 divisors (see below), whose sum is σ = 1021578960. Its totient is φ = 1021303920.

The previous prime is 1021441423. The next prime is 1021441457. The reversal of 1021441439 is 9341441201.

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 1021441439 - 2⁴ = 1021441423 is a prime.

It is a super-2 number, since 2×1021441439² = 2086685226612781442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021441139) 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, 56942 + ... + 72699.

It is an arithmetic number, because the mean of its divisors is an integer number (255394740).

Almost surely, 2^1021441439 is an apocalyptic number.

1021441439 is a deficient number, since it is larger than the sum of its proper divisors (137521).

1021441439 is an equidigital number, since it uses as much as digits as its factorization.

1021441439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137520.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 1021441439 is about 31959.9974812264. The cubic root of 1021441439 is about 1007.0966645500.

The spelling of 1021441439 in words is "one billion, twenty-one million, four hundred forty-one thousand, four hundred thirty-nine".