161248138 has 4 divisors (see below), whose sum is σ = 241872210. Its totient is φ = 80624068.

The previous prime is 161248127. The next prime is 161248141. The reversal of 161248138 is 831842161.

161248138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831842161 = 101 ⋅8236061.

It can be written as a sum of positive squares in only one way, i.e., 156825529 + 4422609 = 12523^2 + 2103^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40312033 + ... + 40312036.

Almost surely, 2^161248138 is an apocalyptic number.

161248138 is a deficient number, since it is larger than the sum of its proper divisors (80624072).

161248138 is an equidigital number, since it uses as much as digits as its factorization.

161248138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80624071.

The product of its digits is 9216, while the sum is 34.

The square root of 161248138 is about 12698.3517828102. The cubic root of 161248138 is about 544.2915216802.

The spelling of 161248138 in words is "one hundred sixty-one million, two hundred forty-eight thousand, one hundred thirty-eight".