161287433 has 2 divisors, whose sum is σ = 161287434. Its totient is φ = 161287432.

The previous prime is 161287421. The next prime is 161287457. The reversal of 161287433 is 334782161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140375104 + 20912329 = 11848^2 + 4573^2 .

It is a cyclic number.

It is not a de Polignac number, because 161287433 - 2¹⁰ = 161286409 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 161287393 and 161287402.

It is not a weakly prime, because it can be changed into another prime (161287463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80643716 + 80643717.

It is an arithmetic number, because the mean of its divisors is an integer number (80643717).

Almost surely, 2^161287433 is an apocalyptic number.

It is an amenable number.

161287433 is a deficient number, since it is larger than the sum of its proper divisors (1).

161287433 is an equidigital number, since it uses as much as digits as its factorization.

161287433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 35.

The square root of 161287433 is about 12699.8989366058. The cubic root of 161287433 is about 544.3357313860.

The spelling of 161287433 in words is "one hundred sixty-one million, two hundred eighty-seven thousand, four hundred thirty-three".