161421317 has 8 divisors (see below), whose sum is σ = 162518400. Its totient is φ = 160328224.

The previous prime is 161421313. The next prime is 161421319. The reversal of 161421317 is 713124161.

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 161421317 - 2² = 161421313 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161421313) 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, 135398 + ... + 136584.

It is an arithmetic number, because the mean of its divisors is an integer number (20314800).

Almost surely, 2^161421317 is an apocalyptic number.

It is an amenable number.

161421317 is a deficient number, since it is larger than the sum of its proper divisors (1097083).

161421317 is a wasteful number, since it uses less digits than its factorization.

161421317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1995.

The product of its digits is 1008, while the sum is 26.

The square root of 161421317 is about 12705.1689087552. The cubic root of 161421317 is about 544.4863066412.

Adding to 161421317 its reverse (713124161), we get a palindrome (874545478).

The spelling of 161421317 in words is "one hundred sixty-one million, four hundred twenty-one thousand, three hundred seventeen".