1601661201 has 32 divisors (see below), whose sum is σ = 2487936000. Its totient is φ = 897583680.

The previous prime is 1601661181. The next prime is 1601661233. The reversal of 1601661201 is 1021661061.

It is not a de Polignac number, because 1601661201 - 2⁵ = 1601661169 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1601661101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 483850 + ... + 487148.

It is an arithmetic number, because the mean of its divisors is an integer number (77748000).

Almost surely, 2^1601661201 is an apocalyptic number.

It is an amenable number.

1601661201 is a deficient number, since it is larger than the sum of its proper divisors (886274799).

1601661201 is a wasteful number, since it uses less digits than its factorization.

1601661201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3749.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 1601661201 is about 40020.7596254744. The cubic root of 1601661201 is about 1170.0117370435.

The spelling of 1601661201 in words is "one billion, six hundred one million, six hundred sixty-one thousand, two hundred one".