161201956 has 24 divisors (see below), whose sum is σ = 299108376. Its totient is φ = 75755520.

The previous prime is 161201951. The next prime is 161201977. The reversal of 161201956 is 659102161.

It can be written as a sum of positive squares in 4 ways, for example, as 36120100 + 125081856 = 6010^2 + 11184^2 .

It is not an unprimeable number, because it can be changed into a prime (161201951) 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, 73516 + ... + 75676.

It is an arithmetic number, because the mean of its divisors is an integer number (12462849).

Almost surely, 2^161201956 is an apocalyptic number.

It is an amenable number.

161201956 is a deficient number, since it is larger than the sum of its proper divisors (137906420).

161201956 is a wasteful number, since it uses less digits than its factorization.

161201956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3279 (or 3277 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 161201956 is about 12696.5332276177. The cubic root of 161201956 is about 544.2395544214.

The spelling of 161201956 in words is "one hundred sixty-one million, two hundred one thousand, nine hundred fifty-six".