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12088085281 = 80914942009
BaseRepresentation
bin10110100001000000…
…11000101100100001
31011012102212100122021
423100200120230201
5144224022212111
65315253341441
7605361013066
oct132040305441
934172770567
1012088085281
115143455428
122414337881
1311a84960ac
148295cac6d
154ab36ed71
hex2d0818b21

12088085281 has 4 divisors (see below), whose sum is σ = 12103028100. Its totient is φ = 12073142464.

The previous prime is 12088085249. The next prime is 12088085363. The reversal of 12088085281 is 18258088021.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10280134881 + 1807950400 = 101391^2 + 42520^2 .

It is a cyclic number.

It is not a de Polignac number, because 12088085281 - 25 = 12088085249 is a prime.

It is a super-2 number, since 2×120880852812 (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12088085221) 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, 7470196 + ... + 7471813.

It is an arithmetic number, because the mean of its divisors is an integer number (3025757025).

Almost surely, 212088085281 is an apocalyptic number.

It is an amenable number.

12088085281 is a deficient number, since it is larger than the sum of its proper divisors (14942819).

12088085281 is an equidigital number, since it uses as much as digits as its factorization.

12088085281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14942818.

The product of its (nonzero) digits is 81920, while the sum is 43.

The spelling of 12088085281 in words is "twelve billion, eighty-eight million, eighty-five thousand, two hundred eighty-one".

Divisors: 1 809 14942009 12088085281