161481405 has 8 divisors (see below), whose sum is σ = 258370272. Its totient is φ = 86123408.

The previous prime is 161481403. The next prime is 161481409. The reversal of 161481405 is 504184161.

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 161481405 - 2¹ = 161481403 is a prime.

It is a super-3 number, since 3×161481405³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161481401) 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 7 ways as a sum of consecutive naturals, for example, 5382699 + ... + 5382728.

It is an arithmetic number, because the mean of its divisors is an integer number (32296284).

Almost surely, 2^161481405 is an apocalyptic number.

161481405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161481405 is a deficient number, since it is larger than the sum of its proper divisors (96888867).

161481405 is a wasteful number, since it uses less digits than its factorization.

161481405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10765435.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 161481405 is about 12707.5333955886. The cubic root of 161481405 is about 544.5538587157.

The spelling of 161481405 in words is "one hundred sixty-one million, four hundred eighty-one thousand, four hundred five".