78111201 has 16 divisors (see below), whose sum is σ = 119158784. Its totient is φ = 44585424.

The previous prime is 78111199. The next prime is 78111251. The reversal of 78111201 is 10211187.

It is not a de Polignac number, because 78111201 - 2¹ = 78111199 is a prime.

It is a super-2 number, since 2×78111201² = 12202719443324802, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78111251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26466 + ... + 29268.

It is an arithmetic number, because the mean of its divisors is an integer number (7447424).

Almost surely, 2^78111201 is an apocalyptic number.

It is an amenable number.

78111201 is a deficient number, since it is larger than the sum of its proper divisors (41047583).

78111201 is a wasteful number, since it uses less digits than its factorization.

78111201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4140.

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

The square root of 78111201 is about 8838.0541410426. The cubic root of 78111201 is about 427.4688161652.

Adding to 78111201 its reverse (10211187), we get a palindrome (88322388).

The spelling of 78111201 in words is "seventy-eight million, one hundred eleven thousand, two hundred one".