161343731 has 2 divisors, whose sum is σ = 161343732. Its totient is φ = 161343730.

The previous prime is 161343691. The next prime is 161343751. The reversal of 161343731 is 137343161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161343731 - 2¹⁰ = 161342707 is a prime.

It is a super-2 number, since 2×161343731² = 52063599066000722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161343694 and 161343703.

It is not a weakly prime, because it can be changed into another prime (161343751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80671865 + 80671866.

It is an arithmetic number, because the mean of its divisors is an integer number (80671866).

Almost surely, 2^161343731 is an apocalyptic number.

161343731 is a deficient number, since it is larger than the sum of its proper divisors (1).

161343731 is an equidigital number, since it uses as much as digits as its factorization.

161343731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 29.

The square root of 161343731 is about 12702.1152175533. The cubic root of 161343731 is about 544.3990581800.

Adding to 161343731 its reverse (137343161), we get a palindrome (298686892).

The spelling of 161343731 in words is "one hundred sixty-one million, three hundred forty-three thousand, seven hundred thirty-one".