161624429 has 2 divisors, whose sum is σ = 161624430. Its totient is φ = 161624428.

The previous prime is 161624387. The next prime is 161624461. The reversal of 161624429 is 924426161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92352100 + 69272329 = 9610^2 + 8323^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161624429 is a prime.

It is a super-2 number, since 2×161624429² = 52244912099152082, which contains 22 as substring.

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 (161624629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80812214 + 80812215.

It is an arithmetic number, because the mean of its divisors is an integer number (80812215).

Almost surely, 2^161624429 is an apocalyptic number.

It is an amenable number.

161624429 is a deficient number, since it is larger than the sum of its proper divisors (1).

161624429 is an equidigital number, since it uses as much as digits as its factorization.

161624429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 35.

The square root of 161624429 is about 12713.1596780659. The cubic root of 161624429 is about 544.7145816348.

The spelling of 161624429 in words is "one hundred sixty-one million, six hundred twenty-four thousand, four hundred twenty-nine".