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87881069 is a prime number
BaseRepresentation
bin1010011110011…
…11010101101101
320010100211011102
411033033111231
5134444143234
612415332445
72114656013
oct517172555
9203324142
1087881069
1145674391
1225521125
131528c643
14b9588b3
157aadc7e
hex53cf56d

87881069 has 2 divisors, whose sum is σ = 87881070. Its totient is φ = 87881068.

The previous prime is 87881033. The next prime is 87881071. The reversal of 87881069 is 96018878.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86955625 + 925444 = 9325^2 + 962^2 .

It is a cyclic number.

It is not a de Polignac number, because 87881069 - 212 = 87876973 is a prime.

It is a super-2 number, since 2×878810692 = 15446164577165522, which contains 22 as substring.

Together with 87881071, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87881029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43940534 + 43940535.

It is an arithmetic number, because the mean of its divisors is an integer number (43940535).

Almost surely, 287881069 is an apocalyptic number.

It is an amenable number.

87881069 is a deficient number, since it is larger than the sum of its proper divisors (1).

87881069 is an equidigital number, since it uses as much as digits as its factorization.

87881069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 87881069 is about 9374.4903328128. The cubic root of 87881069 is about 444.5955488548.

The spelling of 87881069 in words is "eighty-seven million, eight hundred eighty-one thousand, sixty-nine".