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80117381 is a prime number
BaseRepresentation
bin1001100011001…
…11111010000101
312120202101101102
410301213322011
5131002224011
611541105445
71661662241
oct461477205
9176671342
1080117381
1141251413
12229b8285
13137a1946
14a8d7421
15707873b
hex4c67e85

80117381 has 2 divisors, whose sum is σ = 80117382. Its totient is φ = 80117380.

The previous prime is 80117377. The next prime is 80117383. The reversal of 80117381 is 18371108.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74114881 + 6002500 = 8609^2 + 2450^2 .

It is a cyclic number.

It is not a de Polignac number, because 80117381 - 22 = 80117377 is a prime.

It is a super-2 number, since 2×801173812 = 12837589476598322, which contains 22 as substring.

Together with 80117383, 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 (80117383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40058690 + 40058691.

It is an arithmetic number, because the mean of its divisors is an integer number (40058691).

Almost surely, 280117381 is an apocalyptic number.

It is an amenable number.

80117381 is a deficient number, since it is larger than the sum of its proper divisors (1).

80117381 is an equidigital number, since it uses as much as digits as its factorization.

80117381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 29.

The square root of 80117381 is about 8950.8313021752. The cubic root of 80117381 is about 431.0975764346.

Adding to 80117381 its reverse (18371108), we get a palindrome (98488489).

The spelling of 80117381 in words is "eighty million, one hundred seventeen thousand, three hundred eighty-one".