161957000 has 32 divisors (see below), whose sum is σ = 378981720. Its totient is φ = 64782400.

The previous prime is 161956999. The next prime is 161957039. The reversal of 161957000 is 759161.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 96314596 + 65642404 = 9814^2 + 8102^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79979 + ... + 81978.

Almost surely, 2^161957000 is an apocalyptic number.

161957000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161957000 is an abundant number, since it is smaller than the sum of its proper divisors (217024720).

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

161957000 is a wasteful number, since it uses less digits than its factorization.

161957000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161978 (or 161964 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 29.

The square root of 161957000 is about 12726.2327497182. The cubic root of 161957000 is about 545.0879413683.

The spelling of 161957000 in words is "one hundred sixty-one million, nine hundred fifty-seven thousand".