169091378 has 4 divisors (see below), whose sum is σ = 253637070. Its totient is φ = 84545688.

The previous prime is 169091347. The next prime is 169091381. The reversal of 169091378 is 873190961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 873190961 = 19 ⋅45957419.

It can be written as a sum of positive squares in only one way, i.e., 118439689 + 50651689 = 10883^2 + 7117^2 .

It is a super-2 number, since 2×169091378² = 57183788227877768, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42272843 + ... + 42272846.

Almost surely, 2^169091378 is an apocalyptic number.

169091378 is a deficient number, since it is larger than the sum of its proper divisors (84545692).

169091378 is an equidigital number, since it uses as much as digits as its factorization.

169091378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84545691.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 169091378 is about 13003.5140635138. The cubic root of 169091378 is about 552.9771100379.

The spelling of 169091378 in words is "one hundred sixty-nine million, ninety-one thousand, three hundred seventy-eight".