1601654621 has 16 divisors (see below), whose sum is σ = 1869782400. Its totient is φ = 1371404160.

The previous prime is 1601654617. The next prime is 1601654623. The reversal of 1601654621 is 1264561061.

It is not a de Polignac number, because 1601654621 - 2² = 1601654617 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 (1601654623) 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, 441005 + ... + 444621.

It is an arithmetic number, because the mean of its divisors is an integer number (116861400).

Almost surely, 2^1601654621 is an apocalyptic number.

It is an amenable number.

1601654621 is a deficient number, since it is larger than the sum of its proper divisors (268127779).

1601654621 is an equidigital number, since it uses as much as digits as its factorization.

1601654621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4929 (or 4915 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1601654621 is about 40020.6774180548. The cubic root of 1601654621 is about 1170.0101348137.

The spelling of 1601654621 in words is "one billion, six hundred one million, six hundred fifty-four thousand, six hundred twenty-one".