1043021661 has 16 divisors (see below), whose sum is σ = 1518443328. Its totient is φ = 631584000.

The previous prime is 1043021659. The next prime is 1043021669. The reversal of 1043021661 is 1661203401.

It is not a de Polignac number, because 1043021661 - 2¹ = 1043021659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1043021669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26475 + ... + 52791.

It is an arithmetic number, because the mean of its divisors is an integer number (94902708).

Almost surely, 2^1043021661 is an apocalyptic number.

1043021661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1043021661 is a deficient number, since it is larger than the sum of its proper divisors (475421667).

1043021661 is a wasteful number, since it uses less digits than its factorization.

1043021661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27532.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1043021661 is about 32295.8458783788. The cubic root of 1043021661 is about 1014.1396807761.

The spelling of 1043021661 in words is "one billion, forty-three million, twenty-one thousand, six hundred sixty-one".