1601944091 has 8 divisors (see below), whose sum is σ = 1761337344. Its totient is φ = 1444844520.

The previous prime is 1601944063. The next prime is 1601944109. The reversal of 1601944091 is 1904491061.

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

It is a cyclic number.

It is not a de Polignac number, because 1601944091 - 2²⁶ = 1534835227 is a prime.

It is a super-3 number, since 3×1601944091³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1601944031) 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, 571955 + ... + 574748.

It is an arithmetic number, because the mean of its divisors is an integer number (220167168).

Almost surely, 2^1601944091 is an apocalyptic number.

1601944091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1601944091 is a deficient number, since it is larger than the sum of its proper divisors (159393253).

1601944091 is a wasteful number, since it uses less digits than its factorization.

1601944091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1146841.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 1601944091 is about 40024.2937601652. The cubic root of 1601944091 is about 1170.0806165992.

The spelling of 1601944091 in words is "one billion, six hundred one million, nine hundred forty-four thousand, ninety-one".