1059821661 has 8 divisors (see below), whose sum is σ = 1437046560. Its totient is φ = 694572272.

The previous prime is 1059821641. The next prime is 1059821671. The reversal of 1059821661 is 1661289501.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1059821661 - 2⁶ = 1059821597 is a prime.

It is a super-2 number, since 2×1059821661² = 2246443906249597842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1059821641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2993670 + ... + 2994023.

It is an arithmetic number, because the mean of its divisors is an integer number (179630820).

Almost surely, 2^1059821661 is an apocalyptic number.

It is an amenable number.

1059821661 is a deficient number, since it is larger than the sum of its proper divisors (377224899).

1059821661 is an equidigital number, since it uses as much as digits as its factorization.

1059821661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5987755.

The product of its (nonzero) digits is 25920, while the sum is 39.

The square root of 1059821661 is about 32554.9022575710. The cubic root of 1059821661 is about 1019.5556378531. Note that the first 3 decimals are identical.

The spelling of 1059821661 in words is "one billion, fifty-nine million, eight hundred twenty-one thousand, six hundred sixty-one".