Search a number
-
+
161491600 = 2452403729
BaseRepresentation
bin10011010000000…
…10101010010000
3102020212121211101
421220002222100
5312320212400
624005154144
74000440664
oct1150025220
9366777741
10161491600
1183181036
12460bb954
13275c367a
141763a8a4
15e29e56a
hex9a02a90

161491600 has 30 divisors (see below), whose sum is σ = 387984530. Its totient is φ = 64596480.

The previous prime is 161491591. The next prime is 161491607. The reversal of 161491600 is 6194161.

It can be written as a sum of positive squares in 3 ways, for example, as 9314704 + 152176896 = 3052^2 + 12336^2 .

It is not an unprimeable number, because it can be changed into a prime (161491607) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 201465 + ... + 202264.

Almost surely, 2161491600 is an apocalyptic number.

161491600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161491600 is an abundant number, since it is smaller than the sum of its proper divisors (226492930).

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

161491600 is a wasteful number, since it uses less digits than its factorization.

161491600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403747 (or 403736 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 161491600 is about 12707.9345292616. The cubic root of 161491600 is about 544.5653184660.

The spelling of 161491600 in words is "one hundred sixty-one million, four hundred ninety-one thousand, six hundred".

Divisors: 1 2 4 5 8 10 16 20 25 40 50 80 100 200 400 403729 807458 1614916 2018645 3229832 4037290 6459664 8074580 10093225 16149160 20186450 32298320 40372900 80745800 161491600