78111097 has 4 divisors (see below), whose sum is σ = 78136740. Its totient is φ = 78085456.

The previous prime is 78111083. The next prime is 78111101. The reversal of 78111097 is 79011187.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35652841 + 42458256 = 5971^2 + 6516^2 .

It is a cyclic number.

It is not a de Polignac number, because 78111097 - 2²³ = 69722489 is a prime.

It is a super-2 number, since 2×78111097² = 12202686949086818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78111017) 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, 7522 + ... + 14587.

It is an arithmetic number, because the mean of its divisors is an integer number (19534185).

Almost surely, 2^78111097 is an apocalyptic number.

It is an amenable number.

78111097 is a deficient number, since it is larger than the sum of its proper divisors (25643).

78111097 is a wasteful number, since it uses less digits than its factorization.

78111097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25642.

The product of its (nonzero) digits is 3528, while the sum is 34.

The square root of 78111097 is about 8838.0482573926. The cubic root of 78111097 is about 427.4686264495.

It can be divided in two parts, 7 and 8111097, that added together give a square (8111104 = 2848²).

The spelling of 78111097 in words is "seventy-eight million, one hundred eleven thousand, ninety-seven".