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87880549 is a prime number
BaseRepresentation
bin1010011110011…
…11001101100101
320010100210110011
411033033031211
5134444134144
612415330221
72114654341
oct517171545
9203323404
1087880549
1145673a59
1225520971
131528c333
14b958621
157aada34
hex53cf365

87880549 has 2 divisors, whose sum is σ = 87880550. Its totient is φ = 87880548.

The previous prime is 87880547. The next prime is 87880561. The reversal of 87880549 is 94508878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86397025 + 1483524 = 9295^2 + 1218^2 .

It is a cyclic number.

It is not a de Polignac number, because 87880549 - 21 = 87880547 is a prime.

Together with 87880547, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87880543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43940274 + 43940275.

It is an arithmetic number, because the mean of its divisors is an integer number (43940275).

Almost surely, 287880549 is an apocalyptic number.

It is an amenable number.

87880549 is a deficient number, since it is larger than the sum of its proper divisors (1).

87880549 is an equidigital number, since it uses as much as digits as its factorization.

87880549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 645120, while the sum is 49.

The square root of 87880549 is about 9374.4625979306. The cubic root of 87880549 is about 444.5946719494.

The spelling of 87880549 in words is "eighty-seven million, eight hundred eighty thousand, five hundred forty-nine".