161654331 has 8 divisors (see below), whose sum is σ = 219072784. Its totient is φ = 106002720.

The previous prime is 161654321. The next prime is 161654347. The reversal of 161654331 is 133456161.

161654331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 161654331 - 2¹⁷ = 161523259 is a prime.

It is a super-2 number, since 2×161654331² = 52264245462115122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161654321) 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, 441496 + ... + 441861.

It is an arithmetic number, because the mean of its divisors is an integer number (27384098).

Almost surely, 2^161654331 is an apocalyptic number.

161654331 is a deficient number, since it is larger than the sum of its proper divisors (57418453).

161654331 is an equidigital number, since it uses as much as digits as its factorization.

161654331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883421.

The product of its digits is 6480, while the sum is 30.

The square root of 161654331 is about 12714.3356491796. The cubic root of 161654331 is about 544.7481719592.

The spelling of 161654331 in words is "one hundred sixty-one million, six hundred fifty-four thousand, three hundred thirty-one".