1601156881 has 8 divisors (see below), whose sum is σ = 1620116640. Its totient is φ = 1582271328.

The previous prime is 1601156867. The next prime is 1601156897. The reversal of 1601156881 is 1886511061.

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 1601156881 - 2¹⁵ = 1601124113 is a prime.

It is a super-2 number, since 2×1601156881² = 5127406715147296322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1601156881.

It is not an unprimeable number, because it can be changed into a prime (1601156281) 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, 25470 + ... + 62056.

It is an arithmetic number, because the mean of its divisors is an integer number (202514580).

Almost surely, 2^1601156881 is an apocalyptic number.

It is an amenable number.

1601156881 is a deficient number, since it is larger than the sum of its proper divisors (18959759).

1601156881 is a wasteful number, since it uses less digits than its factorization.

1601156881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37103.

The product of its (nonzero) digits is 11520, while the sum is 37.

The square root of 1601156881 is about 40014.4583994336. The cubic root of 1601156881 is about 1169.8889224180. Note that the first 3 decimals are identical.

The spelling of 1601156881 in words is "one billion, six hundred one million, one hundred fifty-six thousand, eight hundred eighty-one".