161431433 has 2 divisors, whose sum is σ = 161431434. Its totient is φ = 161431432.

The previous prime is 161431381. The next prime is 161431441. The reversal of 161431433 is 334134161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161086864 + 344569 = 12692^2 + 587^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161431433 is a prime.

It is not a weakly prime, because it can be changed into another prime (161431463) 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, 80715716 + 80715717.

It is an arithmetic number, because the mean of its divisors is an integer number (80715717).

Almost surely, 2^161431433 is an apocalyptic number.

It is an amenable number.

161431433 is a deficient number, since it is larger than the sum of its proper divisors (1).

161431433 is an equidigital number, since it uses as much as digits as its factorization.

161431433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 26.

The square root of 161431433 is about 12705.5670082055. The cubic root of 161431433 is about 544.4976804146.

Adding to 161431433 its reverse (334134161), we get a palindrome (495565594).

It can be divided in two parts, 16143 and 1433, that added together give a cube (17576 = 26³).

The spelling of 161431433 in words is "one hundred sixty-one million, four hundred thirty-one thousand, four hundred thirty-three".