161591050 has 12 divisors (see below), whose sum is σ = 300559446. Its totient is φ = 64636400.

The previous prime is 161591021. The next prime is 161591051. The reversal of 161591050 is 50195161.

It can be written as a sum of positive squares in 3 ways, for example, as 151216209 + 10374841 = 12297^2 + 3221^2 .

It is a super-2 number, since 2×161591050² = 52223334880205000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161591051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1615861 + ... + 1615960.

Almost surely, 2^161591050 is an apocalyptic number.

161591050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161591050 is a deficient number, since it is larger than the sum of its proper divisors (138968396).

161591050 is a wasteful number, since it uses less digits than its factorization.

161591050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3231833 (or 3231828 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 28.

The square root of 161591050 is about 12711.8468367110. The cubic root of 161591050 is about 544.6770805385.

It can be divided in two parts, 1615 and 91050, that added together give a triangular number (92665 = T₄₃₀).

The spelling of 161591050 in words is "one hundred sixty-one million, five hundred ninety-one thousand, fifty".