1611942201 has 21 divisors (see below), whose sum is σ = 2418434101. Its totient is φ = 1073905452.

The previous prime is 1611942187. The next prime is 1611942203. The reversal of 1611942201 is 1022491161.

The square root of 1611942201 is 40149.

It is a perfect power (a square), and thus also a powerful number.

1611942201 is a `hidden beast` number, since 1 + 611 + 9 + 42 + 2 + 0 + 1 = 666.

It is not a de Polignac number, because 1611942201 - 2¹⁵ = 1611909433 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1611942203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 1083280 + ... + 1084766.

Almost surely, 2^1611942201 is an apocalyptic number.

1611942201 is the 40149-th square number.

1611942201 is the 20075-th centered octagonal number.

It is an amenable number.

1611942201 is a deficient number, since it is larger than the sum of its proper divisors (806491900).

1611942201 is an frugal number, since it uses more digits than its factorization.

1611942201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2992 (or 1490 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The cubic root of 1611942201 is about 1172.5098193251.

The spelling of 1611942201 in words is "one billion, six hundred eleven million, nine hundred forty-two thousand, two hundred one".