78081101 has 4 divisors (see below), whose sum is σ = 89235552. Its totient is φ = 66926652.

The previous prime is 78081083. The next prime is 78081121. The reversal of 78081101 is 10118087.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78081101 - 2¹⁸ = 77818957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78081121) 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, 5577215 + ... + 5577228.

It is an arithmetic number, because the mean of its divisors is an integer number (22308888).

Almost surely, 2^78081101 is an apocalyptic number.

It is an amenable number.

78081101 is a deficient number, since it is larger than the sum of its proper divisors (11154451).

78081101 is a wasteful number, since it uses less digits than its factorization.

78081101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11154450.

The product of its (nonzero) digits is 448, while the sum is 26.

The square root of 78081101 is about 8836.3511134404. The cubic root of 78081101 is about 427.4139010174.

Adding to 78081101 its reverse (10118087), we get a palindrome (88199188).

The spelling of 78081101 in words is "seventy-eight million, eighty-one thousand, one hundred one".