161138964 has 72 divisors (see below), whose sum is σ = 445227328. Its totient is φ = 44432640.

The previous prime is 161138941. The next prime is 161138969. The reversal of 161138964 is 469831161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161138969) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69504 + ... + 71784.

Almost surely, 2^161138964 is an apocalyptic number.

161138964 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161138964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (222613664).

161138964 is an abundant number, since it is smaller than the sum of its proper divisors (284088364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161138964 is a wasteful number, since it uses less digits than its factorization.

161138964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2353 (or 2322 counting only the distinct ones).

The product of its digits is 31104, while the sum is 39.

The square root of 161138964 is about 12694.0523080693. The cubic root of 161138964 is about 544.1686553552.

The spelling of 161138964 in words is "one hundred sixty-one million, one hundred thirty-eight thousand, nine hundred sixty-four".