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86881961 = 99187671
BaseRepresentation
bin1010010110110…
…11011010101001
320001111001122102
411023123122221
5134220210321
612342103145
72103325115
oct513333251
9201431572
1086881961
1145051781
122511aab5
1314ccc95a
14b778745
157962c0b
hex52db6a9

86881961 has 4 divisors (see below), whose sum is σ = 86970624. Its totient is φ = 86793300.

The previous prime is 86881943. The next prime is 86881979. The reversal of 86881961 is 16918868.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (86881943) and next prime (86881979).

It is a cyclic number.

It is not a de Polignac number, because 86881961 - 214 = 86865577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (86881931) 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, 42845 + ... + 44826.

It is an arithmetic number, because the mean of its divisors is an integer number (21742656).

Almost surely, 286881961 is an apocalyptic number.

86881961 is the 4169-th centered decagonal number.

It is an amenable number.

86881961 is a deficient number, since it is larger than the sum of its proper divisors (88663).

86881961 is an equidigital number, since it uses as much as digits as its factorization.

86881961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88662.

The product of its digits is 165888, while the sum is 47.

The square root of 86881961 is about 9321.0493507974. The cubic root of 86881961 is about 442.9042743704.

The spelling of 86881961 in words is "eighty-six million, eight hundred eighty-one thousand, nine hundred sixty-one".

Divisors: 1 991 87671 86881961