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131242187 is a prime number
BaseRepresentation
bin1111101001010…
…01100011001011
3100010221210102202
413310221203023
5232044222222
621004550415
73152353166
oct764514313
9303853382
10131242187
11680a021a
1237b5240b
1321261ccb
1413604add
15b7c6892
hex7d298cb

131242187 has 2 divisors, whose sum is σ = 131242188. Its totient is φ = 131242186.

The previous prime is 131242183. The next prime is 131242201. The reversal of 131242187 is 781242131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131242187 - 22 = 131242183 is a prime.

It is not a weakly prime, because it can be changed into another prime (131242183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65621093 + 65621094.

It is an arithmetic number, because the mean of its divisors is an integer number (65621094).

Almost surely, 2131242187 is an apocalyptic number.

131242187 is a deficient number, since it is larger than the sum of its proper divisors (1).

131242187 is an equidigital number, since it uses as much as digits as its factorization.

131242187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 29.

The square root of 131242187 is about 11456.0982450396. The cubic root of 131242187 is about 508.1880942648.

The spelling of 131242187 in words is "one hundred thirty-one million, two hundred forty-two thousand, one hundred eighty-seven".