78101011 has 4 divisors (see below), whose sum is σ = 78126192.
Its totient is φ = 78075832.
The previous prime is 78101003. The next prime is 78101027. The reversal of 78101011 is 11010187.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 78101011 - 23 = 78101003 is a prime.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 78101011.
It is not an unprimeable number, because it can be changed into a prime (78101071) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7156 + ... + 14401.
It is an arithmetic number, because the mean of its divisors is an integer number (19531548).
Almost surely, 278101011 is an apocalyptic number.
78101011 is a deficient number, since it is larger than the sum of its proper divisors (25181).
78101011 is a wasteful number, since it uses less digits than its factorization.
78101011 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 25180.
The product of its (nonzero) digits is 56, while the sum is 19.
The square root of 78101011 is about 8837.4776378784.
The cubic root of 78101011 is about 427.4502268694.
Adding to 78101011 its reverse (11010187), we get a palindrome (89111198).
It can be divided in two parts, 7 and 8101011, that added together give a palindrome (8101018).
The spelling of 78101011 in words is "seventy-eight million, one hundred one thousand, eleven".