1601721141 has 8 divisors (see below), whose sum is σ = 2136165600. Its totient is φ = 1067545392.

The previous prime is 1601721139. The next prime is 1601721167. The reversal of 1601721141 is 1411271061.

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

It is not a de Polignac number, because 1601721141 - 2¹ = 1601721139 is a prime.

It is a super-2 number, since 2×1601721141² = 5131021227052683762, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601721941) 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, 52830 + ... + 77423.

It is an arithmetic number, because the mean of its divisors is an integer number (267020700).

Almost surely, 2^1601721141 is an apocalyptic number.

It is an amenable number.

1601721141 is a deficient number, since it is larger than the sum of its proper divisors (534444459).

1601721141 is a wasteful number, since it uses less digits than its factorization.

1601721141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134355.

The product of its (nonzero) digits is 336, while the sum is 24.

The square root of 1601721141 is about 40021.5084798162. The cubic root of 1601721141 is about 1170.0263322293.

The spelling of 1601721141 in words is "one billion, six hundred one million, seven hundred twenty-one thousand, one hundred forty-one".