161516429 has 2 divisors, whose sum is σ = 161516430. Its totient is φ = 161516428.

The previous prime is 161516401. The next prime is 161516449. The reversal of 161516429 is 924615161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158810404 + 2706025 = 12602^2 + 1645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161516429 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161516449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80758214 + 80758215.

It is an arithmetic number, because the mean of its divisors is an integer number (80758215).

Almost surely, 2^161516429 is an apocalyptic number.

It is an amenable number.

161516429 is a deficient number, since it is larger than the sum of its proper divisors (1).

161516429 is an equidigital number, since it uses as much as digits as its factorization.

161516429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 35.

The square root of 161516429 is about 12708.9114010603. The cubic root of 161516429 is about 544.5932256335.

The spelling of 161516429 in words is "one hundred sixty-one million, five hundred sixteen thousand, four hundred twenty-nine".