161258140 has 24 divisors (see below), whose sum is σ = 339503472. Its totient is φ = 64339200.

The previous prime is 161258137. The next prime is 161258147. The reversal of 161258140 is 41852161.

161258140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 161258099 and 161258108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161258147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2034 + ... + 18073.

It is an arithmetic number, because the mean of its divisors is an integer number (14145978).

Almost surely, 2^161258140 is an apocalyptic number.

161258140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161258140 is an abundant number, since it is smaller than the sum of its proper divisors (178245332).

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

161258140 is a wasteful number, since it uses less digits than its factorization.

161258140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20517 (or 20515 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 161258140 is about 12698.7456073425. The cubic root of 161258140 is about 544.3027753321.

The spelling of 161258140 in words is "one hundred sixty-one million, two hundred fifty-eight thousand, one hundred forty".