78011121 has 8 divisors (see below), whose sum is σ = 104155264. Its totient is φ = 51937200.

The previous prime is 78011107. The next prime is 78011123. The reversal of 78011121 is 12111087.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78011121 - 2¹⁸ = 77748977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78011123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14905 + ... + 19446.

It is an arithmetic number, because the mean of its divisors is an integer number (13019408).

Almost surely, 2^78011121 is an apocalyptic number.

It is an amenable number.

78011121 is a deficient number, since it is larger than the sum of its proper divisors (26144143).

78011121 is a wasteful number, since it uses less digits than its factorization.

78011121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35111.

The product of its (nonzero) digits is 112, while the sum is 21.

The square root of 78011121 is about 8832.3904465326. The cubic root of 78011121 is about 427.2861732891.

The spelling of 78011121 in words is "seventy-eight million, eleven thousand, one hundred twenty-one".