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131945 = 5112399
BaseRepresentation
bin100000001101101001
320200222212
4200031221
513210240
62454505
71056452
oct401551
9220885
10131945
1190150
1264435
1348098
1436129
1529165
hex20369

131945 has 8 divisors (see below), whose sum is σ = 172800. Its totient is φ = 95920.

The previous prime is 131941. The next prime is 131947. The reversal of 131945 is 549131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 131945 - 22 = 131941 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131945.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131941) 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 7 ways as a sum of consecutive naturals, for example, 1145 + ... + 1254.

It is an arithmetic number, because the mean of its divisors is an integer number (21600).

2131945 is an apocalyptic number.

It is an amenable number.

131945 is a deficient number, since it is larger than the sum of its proper divisors (40855).

131945 is a wasteful number, since it uses less digits than its factorization.

131945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2415.

The product of its digits is 540, while the sum is 23.

The square root of 131945 is about 363.2423433467. The cubic root of 131945 is about 50.9093609873.

The spelling of 131945 in words is "one hundred thirty-one thousand, nine hundred forty-five".

Divisors: 1 5 11 55 2399 11995 26389 131945