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131208730 = 2579307541
BaseRepresentation
bin1111101001000…
…01011000011010
3100010220002112121
413310201120122
5232042134410
621004131454
73152153512
oct764413032
9303802477
10131208730
1168078074
1237b36b8a
132124ca03
14135d6842
15b7bb9da
hex7d2161a

131208730 has 32 divisors (see below), whose sum is σ = 240387840. Its totient is φ = 51554880.

The previous prime is 131208689. The next prime is 131208751. The reversal of 131208730 is 37802131.

It is a junction number, because it is equal to n+sod(n) for n = 131208695 and 131208704.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 242260 + ... + 242800.

It is an arithmetic number, because the mean of its divisors is an integer number (7512120).

Almost surely, 2131208730 is an apocalyptic number.

131208730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

131208730 is a deficient number, since it is larger than the sum of its proper divisors (109179110).

131208730 is a wasteful number, since it uses less digits than its factorization.

131208730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 131208730 is about 11454.6379253122. The cubic root of 131208730 is about 508.1449072011.

The spelling of 131208730 in words is "one hundred thirty-one million, two hundred eight thousand, seven hundred thirty".

Divisors: 1 2 5 10 79 158 307 395 541 614 790 1082 1535 2705 3070 5410 24253 42739 48506 85478 121265 166087 213695 242530 332174 427390 830435 1660870 13120873 26241746 65604365 131208730