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131689197 = 3223096337
BaseRepresentation
bin1111101100101…
…10101011101101
3100011210111121200
413312112223231
5232203023242
621022320113
73156224343
oct766265355
9304714550
10131689197
1168376052
1238129039
132138a603
14136bd993
15b86404c
hex7d96aed

131689197 has 12 divisors (see below), whose sum is σ = 190330140. Its totient is φ = 87740928.

The previous prime is 131689193. The next prime is 131689223. The reversal of 131689197 is 791986131.

It can be written as a sum of positive squares in 2 ways, for example, as 79762761 + 51926436 = 8931^2 + 7206^2 .

It is not a de Polignac number, because 131689197 - 22 = 131689193 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131689193) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17613 + ... + 23949.

It is an arithmetic number, because the mean of its divisors is an integer number (15860845).

Almost surely, 2131689197 is an apocalyptic number.

It is an amenable number.

131689197 is a deficient number, since it is larger than the sum of its proper divisors (58640943).

131689197 is a wasteful number, since it uses less digits than its factorization.

131689197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8652 (or 8649 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 131689197 is about 11475.5913573114. The cubic root of 131689197 is about 508.7644021946.

The spelling of 131689197 in words is "one hundred thirty-one million, six hundred eighty-nine thousand, one hundred ninety-seven".