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30528121 = 1361137281
BaseRepresentation
bin111010001110…
…1001001111001
32010102222201011
41310131021321
530303344441
63010153521
7520325161
oct164351171
963388634
1030528121
1116261258
12a2828a1
13642b4a0
1440a95a1
152a30581
hex1d1d279

30528121 has 16 divisors (see below), whose sum is σ = 33779088. Its totient is φ = 27417600.

The previous prime is 30528119. The next prime is 30528137. The reversal of 30528121 is 12182503.

It can be written as a sum of positive squares in 8 ways, for example, as 3861225 + 26666896 = 1965^2 + 5164^2 .

It is a cyclic number.

It is not a de Polignac number, because 30528121 - 21 = 30528119 is a prime.

It is a deceptive number, since it divides R30528120.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30528092 and 30528101.

It is not an unprimeable number, because it can be changed into a prime (30528181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108501 + ... + 108781.

It is an arithmetic number, because the mean of its divisors is an integer number (2111193).

Almost surely, 230528121 is an apocalyptic number.

It is an amenable number.

30528121 is a deficient number, since it is larger than the sum of its proper divisors (3250967).

30528121 is a wasteful number, since it uses less digits than its factorization.

30528121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 30528121 is about 5525.2258777357. The cubic root of 30528121 is about 312.5359822034.

The spelling of 30528121 in words is "thirty million, five hundred twenty-eight thousand, one hundred twenty-one".

Divisors: 1 13 61 137 281 793 1781 3653 8357 17141 38497 108641 222833 500461 2348317 30528121