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31920243 = 315496869
BaseRepresentation
bin111100111000…
…1000001110011
32020001201100020
41321301001303
531132421433
63100054523
7535213635
oct171610163
966051306
1031920243
1117022173
12a834443
1367c8024
14434ca55
152c07cb3
hex1e71073

31920243 has 8 divisors (see below), whose sum is σ = 42594000. Its totient is φ = 21263328.

The previous prime is 31920241. The next prime is 31920253. The reversal of 31920243 is 34202913.

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

It is not a de Polignac number, because 31920243 - 21 = 31920241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31920241) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1213 + ... + 8081.

It is an arithmetic number, because the mean of its divisors is an integer number (5324250).

Almost surely, 231920243 is an apocalyptic number.

31920243 is a deficient number, since it is larger than the sum of its proper divisors (10673757).

31920243 is a wasteful number, since it uses less digits than its factorization.

31920243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8421.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 31920243 is about 5649.8002619562. The cubic root of 31920243 is about 317.2162277345.

The spelling of 31920243 in words is "thirty-one million, nine hundred twenty thousand, two hundred forty-three".

Divisors: 1 3 1549 4647 6869 20607 10640081 31920243