2921610561 has 8 divisors (see below), whose sum is σ = 3896280000. Its totient is φ = 1947340752.

The previous prime is 2921610551. The next prime is 2921610577. The reversal of 2921610561 is 1650161292.

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

It is not a de Polignac number, because 2921610561 - 2⁹ = 2921610049 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (2921610551) 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, 82410 + ... + 112403.

It is an arithmetic number, because the mean of its divisors is an integer number (487035000).

Almost surely, 2^2921610561 is an apocalyptic number.

It is an amenable number.

2921610561 is a deficient number, since it is larger than the sum of its proper divisors (974669439).

2921610561 is a wasteful number, since it uses less digits than its factorization.

2921610561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199815.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 2921610561 is about 54051.9246743351. The cubic root of 2921610561 is about 1429.5766365349.

The spelling of 2921610561 in words is "two billion, nine hundred twenty-one million, six hundred ten thousand, five hundred sixty-one".