161361677 has 2 divisors, whose sum is σ = 161361678. Its totient is φ = 161361676.

The previous prime is 161361643. The next prime is 161361689. The reversal of 161361677 is 776163161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121242121 + 40119556 = 11011^2 + 6334^2 .

It is an emirp because it is prime and its reverse (776163161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161361677 - 2¹⁴ = 161345293 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161361677.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161301677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80680838 + 80680839.

It is an arithmetic number, because the mean of its divisors is an integer number (80680839).

Almost surely, 2^161361677 is an apocalyptic number.

It is an amenable number.

161361677 is a deficient number, since it is larger than the sum of its proper divisors (1).

161361677 is an equidigital number, since it uses as much as digits as its factorization.

161361677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 38.

The square root of 161361677 is about 12702.8216156884. The cubic root of 161361677 is about 544.4192416381.

The spelling of 161361677 in words is "one hundred sixty-one million, three hundred sixty-one thousand, six hundred seventy-seven".