161634203 has 2 divisors, whose sum is σ = 161634204. Its totient is φ = 161634202.

The previous prime is 161634199. The next prime is 161634227. The reversal of 161634203 is 302436161.

It is a weak prime.

It is an emirp because it is prime and its reverse (302436161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161634203 - 2² = 161634199 is a prime.

It is a super-2 number, since 2×161634203² = 52251231158890418, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161634233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80817101 + 80817102.

It is an arithmetic number, because the mean of its divisors is an integer number (80817102).

Almost surely, 2^161634203 is an apocalyptic number.

161634203 is a deficient number, since it is larger than the sum of its proper divisors (1).

161634203 is an equidigital number, since it uses as much as digits as its factorization.

161634203 is an odious number, because the sum of its binary digits is odd.

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

The square root of 161634203 is about 12713.5440770857. The cubic root of 161634203 is about 544.7255616849.

The spelling of 161634203 in words is "one hundred sixty-one million, six hundred thirty-four thousand, two hundred three".