161271603 has 12 divisors (see below), whose sum is σ = 236896920. Its totient is φ = 105691776.

The previous prime is 161271599. The next prime is 161271619. The reversal of 161271603 is 306172161.

It is not a de Polignac number, because 161271603 - 2² = 161271599 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161271683) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 151326 + ... + 152387.

It is an arithmetic number, because the mean of its divisors is an integer number (19741410).

Almost surely, 2^161271603 is an apocalyptic number.

161271603 is a deficient number, since it is larger than the sum of its proper divisors (75625317).

161271603 is a wasteful number, since it uses less digits than its factorization.

161271603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303778 (or 303775 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 161271603 is about 12699.2756880068. The cubic root of 161271603 is about 544.3179223594.

The spelling of 161271603 in words is "one hundred sixty-one million, two hundred seventy-one thousand, six hundred three".