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123130231 = 7139126547
BaseRepresentation
bin1110101011011…
…01000101110111
322120200122220221
413111231011313
5223010131411
620115035211
73023406160
oct725550567
9276618827
10123130231
116355a624
123529bb07
131c681933
14124d2767
15ac23071
hex756d177

123130231 has 8 divisors (see below), whose sum is σ = 141733760. Its totient is φ = 104780088.

The previous prime is 123130223. The next prime is 123130243. The reversal of 123130231 is 132031321.

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

It is not a de Polignac number, because 123130231 - 23 = 123130223 is a prime.

It is a super-2 number, since 2×1231302312 = 30322107572226722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123100231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62301 + ... + 64246.

It is an arithmetic number, because the mean of its divisors is an integer number (17716720).

Almost surely, 2123130231 is an apocalyptic number.

123130231 is a deficient number, since it is larger than the sum of its proper divisors (18603529).

123130231 is a wasteful number, since it uses less digits than its factorization.

123130231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126693.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 123130231 is about 11096.4062200336. The cubic root of 123130231 is about 497.4944399773.

Adding to 123130231 its reverse (132031321), we get a palindrome (255161552).

The spelling of 123130231 in words is "one hundred twenty-three million, one hundred thirty thousand, two hundred thirty-one".

Divisors: 1 7 139 973 126547 885829 17590033 123130231