161378827 has 4 divisors (see below), whose sum is σ = 161526240. Its totient is φ = 161231416.

The previous prime is 161378821. The next prime is 161378843. The reversal of 161378827 is 728873161.

161378827 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.

It is a cyclic number.

It is not a de Polignac number, because 161378827 - 2²³ = 152990219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161378821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72052 + ... + 74257.

It is an arithmetic number, because the mean of its divisors is an integer number (40381560).

Almost surely, 2^161378827 is an apocalyptic number.

161378827 is a deficient number, since it is larger than the sum of its proper divisors (147413).

161378827 is a wasteful number, since it uses less digits than its factorization.

161378827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147412.

The product of its digits is 112896, while the sum is 43.

The square root of 161378827 is about 12703.4966446251. The cubic root of 161378827 is about 544.4385284547.

It can be divided in two parts, 16137 and 8827, that added together give a square (24964 = 158²).

The spelling of 161378827 in words is "one hundred sixty-one million, three hundred seventy-eight thousand, eight hundred twenty-seven".