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161521132 = 22371091359
BaseRepresentation
bin10011010000010…
…01110111101100
3102020221010100011
421220021313230
5312322134012
624005543004
74000623043
oct1150116754
9366833304
10161521132
11831a1243
1246114a64
1327603c46
141764755a
15e2a81a7
hex9a09dec

161521132 has 12 divisors (see below), whose sum is σ = 290301760. Its totient is φ = 78577776.

The previous prime is 161521127. The next prime is 161521163. The reversal of 161521132 is 231125161.

It is a happy number.

161521132 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1615211322 = 52178152165122848, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 545532 + ... + 545827.

Almost surely, 2161521132 is an apocalyptic number.

It is an amenable number.

161521132 is a deficient number, since it is larger than the sum of its proper divisors (128780628).

161521132 is a wasteful number, since it uses less digits than its factorization.

161521132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091400 (or 1091398 counting only the distinct ones).

The product of its digits is 360, while the sum is 22.

The square root of 161521132 is about 12709.0964273626. The cubic root of 161521132 is about 544.5985113643.

Adding to 161521132 its reverse (231125161), we get a palindrome (392646293).

The spelling of 161521132 in words is "one hundred sixty-one million, five hundred twenty-one thousand, one hundred thirty-two".

Divisors: 1 2 4 37 74 148 1091359 2182718 4365436 40380283 80760566 161521132