161421313 has 2 divisors, whose sum is σ = 161421314. Its totient is φ = 161421312.

The previous prime is 161421287. The next prime is 161421319. The reversal of 161421313 is 313124161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108014449 + 53406864 = 10393^2 + 7308^2 .

It is a cyclic number.

It is not a de Polignac number, because 161421313 - 2²¹ = 159324161 is a prime.

It is not a weakly prime, because it can be changed into another prime (161421319) 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 as a sum of consecutive naturals, namely, 80710656 + 80710657.

It is an arithmetic number, because the mean of its divisors is an integer number (80710657).

Almost surely, 2^161421313 is an apocalyptic number.

It is an amenable number.

161421313 is a deficient number, since it is larger than the sum of its proper divisors (1).

161421313 is an equidigital number, since it uses as much as digits as its factorization.

161421313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 22.

The square root of 161421313 is about 12705.1687513390. The cubic root of 161421313 is about 544.4863021438.

Adding to 161421313 its reverse (313124161), we get a palindrome (474545474).

The spelling of 161421313 in words is "one hundred sixty-one million, four hundred twenty-one thousand, three hundred thirteen".