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131230679 = 357136749
BaseRepresentation
bin1111101001001…
…10101111010111
3100010221012122112
413310212233113
5232043340204
621004421235
73152304506
oct764465727
9303835575
10131230679
1168092608
1237b4781b
13212599b8
141360083d
15b7c326e
hex7d26bd7

131230679 has 4 divisors (see below), whose sum is σ = 131271000. Its totient is φ = 131190360.

The previous prime is 131230651. The next prime is 131230699. The reversal of 131230679 is 976032131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 976032131 = 1592361297.

It is a cyclic number.

It is not a de Polignac number, because 131230679 - 224 = 114453463 is a prime.

It is a super-2 number, since 2×1312306792 = 34442982221602082, 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 (131230639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14804 + ... + 21945.

It is an arithmetic number, because the mean of its divisors is an integer number (32817750).

Almost surely, 2131230679 is an apocalyptic number.

131230679 is a deficient number, since it is larger than the sum of its proper divisors (40321).

131230679 is an equidigital number, since it uses as much as digits as its factorization.

131230679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40320.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 131230679 is about 11455.5959687831. The cubic root of 131230679 is about 508.1732403024.

The spelling of 131230679 in words is "one hundred thirty-one million, two hundred thirty thousand, six hundred seventy-nine".

Divisors: 1 3571 36749 131230679