161878103 has 2 divisors, whose sum is σ = 161878104. Its totient is φ = 161878102.

The previous prime is 161878099. The next prime is 161878109. The reversal of 161878103 is 301878161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161878103 - 2² = 161878099 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161878109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80939051 + 80939052.

It is an arithmetic number, because the mean of its divisors is an integer number (80939052).

Almost surely, 2^161878103 is an apocalyptic number.

161878103 is a deficient number, since it is larger than the sum of its proper divisors (1).

161878103 is an equidigital number, since it uses as much as digits as its factorization.

161878103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 161878103 is about 12723.1325938230. The cubic root of 161878103 is about 544.9994141901. Note that the first 3 decimals are identical.

The spelling of 161878103 in words is "one hundred sixty-one million, eight hundred seventy-eight thousand, one hundred three".