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55181999 is a prime number
BaseRepresentation
bin1101001010000…
…0001010101111
310211211112110202
43102200022233
5103111310444
65250424115
71240016315
oct322401257
9124745422
1055181999
1129170064
121659203b
13b580c92
1474860b5
154ca034e
hex34a02af

55181999 has 2 divisors, whose sum is σ = 55182000. Its totient is φ = 55181998.

The previous prime is 55181939. The next prime is 55182007. The reversal of 55181999 is 99918155.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-55181999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55181939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27590999 + 27591000.

It is an arithmetic number, because the mean of its divisors is an integer number (27591000).

Almost surely, 255181999 is an apocalyptic number.

55181999 is a deficient number, since it is larger than the sum of its proper divisors (1).

55181999 is an equidigital number, since it uses as much as digits as its factorization.

55181999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145800, while the sum is 47.

The square root of 55181999 is about 7428.4587230461. The cubic root of 55181999 is about 380.7142591096.

The spelling of 55181999 in words is "fifty-five million, one hundred eighty-one thousand, nine hundred ninety-nine".