3855560621 has 4 divisors (see below), whose sum is σ = 4206066144. Its totient is φ = 3505055100.

The previous prime is 3855560609. The next prime is 3855560629. The reversal of 3855560621 is 1260655583.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1260655583 = 11 ⋅114605053.

It is a cyclic number.

It is not a de Polignac number, because 3855560621 - 2¹⁴ = 3855544237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3855560629) 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, 175252745 + ... + 175252766.

It is an arithmetic number, because the mean of its divisors is an integer number (1051516536).

Almost surely, 2^3855560621 is an apocalyptic number.

It is an amenable number.

3855560621 is a deficient number, since it is larger than the sum of its proper divisors (350505523).

3855560621 is a wasteful number, since it uses less digits than its factorization.

3855560621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350505522.

The product of its (nonzero) digits is 216000, while the sum is 41.

The square root of 3855560621 is about 62093.1608230729. The cubic root of 3855560621 is about 1568.0594061826.

The spelling of 3855560621 in words is "three billion, eight hundred fifty-five million, five hundred sixty thousand, six hundred twenty-one".