78901 has 2 divisors, whose sum is σ = 78902. Its totient is φ = 78900.
The previous prime is 78893. The next prime is 78919. The reversal of 78901 is 10987.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 62001 + 16900 = 249^2 + 130^2 .
It is an emirp because it is prime and its reverse (10987) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 78901 - 23 = 78893 is a prime.
It is an alternating number because its digits alternate between odd and even.
78901 is a lucky number.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (78941) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39450 + 39451.
It is an arithmetic number, because the mean of its divisors is an integer number (39451).
278901 is an apocalyptic number.
It is an amenable number.
78901 is a deficient number, since it is larger than the sum of its proper divisors (1).
78901 is an equidigital number, since it uses as much as digits as its factorization.
78901 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 504, while the sum is 25.
The square root of 78901 is about 280.8932181453. The cubic root of 78901 is about 42.8904730141.
It can be divided in two parts, 78 and 901, that added together give a palindrome (979).
The spelling of 78901 in words is "seventy-eight thousand, nine hundred one".
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