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BaseRepresentation
bin100000001110000001
320201000202
4200032001
513210334
62454545
71056515
oct401601
9221022
10131969
1190172
1264455
13480b6
1436145
152917e
hex20381

131969 has 2 divisors, whose sum is σ = 131970. Its totient is φ = 131968.

The previous prime is 131959. The next prime is 132001. The reversal of 131969 is 969131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87025 + 44944 = 295^2 + 212^2 .

It is an emirp because it is prime and its reverse (969131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131969 - 28 = 131713 is a prime.

It is a super-2 number, since 2×1319692 = 34831633922, which contains 22 as substring.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (131909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65984 + 65985.

It is an arithmetic number, because the mean of its divisors is an integer number (65985).

2131969 is an apocalyptic number.

It is an amenable number.

131969 is a deficient number, since it is larger than the sum of its proper divisors (1).

131969 is an equidigital number, since it uses as much as digits as its factorization.

131969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1458, while the sum is 29.

The square root of 131969 is about 363.2753776407. The cubic root of 131969 is about 50.9124475021.

The spelling of 131969 in words is "one hundred thirty-one thousand, nine hundred sixty-nine".