161421316 has 24 divisors (see below), whose sum is σ = 323133440. Its totient is φ = 69118272.

The previous prime is 161421313. The next prime is 161421319. The reversal of 161421316 is 613124161.

It is an interprime number because it is at equal distance from previous prime (161421313) and next prime (161421319).

It is not an unprimeable number, because it can be changed into a prime (161421313) 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, 43261 + ... + 46843.

Almost surely, 2^161421316 is an apocalyptic number.

It is an amenable number.

161421316 is an abundant number, since it is smaller than the sum of its proper divisors (161712124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161421316 is a wasteful number, since it uses less digits than its factorization.

161421316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5203 (or 5201 counting only the distinct ones).

The product of its digits is 864, while the sum is 25.

The square root of 161421316 is about 12705.1688694011. The cubic root of 161421316 is about 544.4863055169.

Adding to 161421316 its reverse (613124161), we get a palindrome (774545477).

The spelling of 161421316 in words is "one hundred sixty-one million, four hundred twenty-one thousand, three hundred sixteen".