778831201 has 4 divisors (see below), whose sum is σ = 779376132. Its totient is φ = 778286272.

The previous prime is 778831187. The next prime is 778831213. The reversal of 778831201 is 102138877.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 102138877 = 227 ⋅449951.

It can be written as a sum of positive squares in 2 ways, for example, as 659256976 + 119574225 = 25676^2 + 10935^2 .

It is a cyclic number.

It is not a de Polignac number, because 778831201 - 2⁵ = 778831169 is a prime.

It is a super-2 number, since 2×778831201² = 1213156079302204802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (778831231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270316 + ... + 273181.

It is an arithmetic number, because the mean of its divisors is an integer number (194844033).

Almost surely, 2^778831201 is an apocalyptic number.

It is an amenable number.

778831201 is a deficient number, since it is larger than the sum of its proper divisors (544931).

778831201 is a wasteful number, since it uses less digits than its factorization.

778831201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544930.

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 778831201 is about 27907.5473841755. The cubic root of 778831201 is about 920.0563926523.

The spelling of 778831201 in words is "seven hundred seventy-eight million, eight hundred thirty-one thousand, two hundred one".