161005481 has 8 divisors (see below), whose sum is σ = 198160704. Its totient is φ = 127388880.

The previous prime is 161005433. The next prime is 161005499. The reversal of 161005481 is 184500161.

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 161005481 - 2⁶ = 161005417 is a prime.

It is a super-2 number, since 2×161005481² = 51845529824082722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161005481.

It is not an unprimeable number, because it can be changed into a prime (161005381) 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, 884555 + ... + 884736.

It is an arithmetic number, because the mean of its divisors is an integer number (24770088).

Almost surely, 2^161005481 is an apocalyptic number.

It is an amenable number.

161005481 is a deficient number, since it is larger than the sum of its proper divisors (37155223).

161005481 is a wasteful number, since it uses less digits than its factorization.

161005481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1769311.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 161005481 is about 12688.7935202682. The cubic root of 161005481 is about 544.0183558271.

The spelling of 161005481 in words is "one hundred sixty-one million, five thousand, four hundred eighty-one".