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149581 = 1011481
BaseRepresentation
bin100100100001001101
321121012001
4210201031
514241311
63112301
71162045
oct444115
9247161
10149581
11a2423
1272691
1353113
143c725
152e4c1
hex2484d

149581 has 4 divisors (see below), whose sum is σ = 151164. Its totient is φ = 148000.

The previous prime is 149579. The next prime is 149603. The reversal of 149581 is 185941.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 111556 + 38025 = 334^2 + 195^2 .

It is a cyclic number.

It is not a de Polignac number, because 149581 - 21 = 149579 is a prime.

It is a super-2 number, since 2×1495812 = 44748951122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640 + ... + 841.

It is an arithmetic number, because the mean of its divisors is an integer number (37791).

2149581 is an apocalyptic number.

It is an amenable number.

149581 is a deficient number, since it is larger than the sum of its proper divisors (1583).

149581 is a wasteful number, since it uses less digits than its factorization.

149581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1582.

The product of its digits is 1440, while the sum is 28.

The square root of 149581 is about 386.7570296711. The cubic root of 149581 is about 53.0834096629.

The spelling of 149581 in words is "one hundred forty-nine thousand, five hundred eighty-one".

Divisors: 1 101 1481 149581