161378913 has 12 divisors (see below), whose sum is σ = 227094288. Its totient is φ = 101922840.

The previous prime is 161378891. The next prime is 161378927. The reversal of 161378913 is 319873161.

161378913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161378913 - 2⁶ = 161378849 is a prime.

It is a super-2 number, since 2×161378913² = 52086307122123138, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is the 12704-th Hogben number.

It is not an unprimeable number, because it can be changed into a prime (161378713) by changing a digit.

It is a nontrivial repunit in base 12703.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73423 + ... + 75588.

It is an arithmetic number, because the mean of its divisors is an integer number (18924524).

Almost surely, 2^161378913 is an apocalyptic number.

It is an amenable number.

161378913 is a deficient number, since it is larger than the sum of its proper divisors (65715375).

161378913 is a wasteful number, since it uses less digits than its factorization.

161378913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149052 (or 149033 counting only the distinct ones).

The product of its digits is 27216, while the sum is 39.

The square root of 161378913 is about 12703.5000295194. The cubic root of 161378913 is about 544.4386251665.

The spelling of 161378913 in words is "one hundred sixty-one million, three hundred seventy-eight thousand, nine hundred thirteen".