632778191 has 4 divisors (see below), whose sum is σ = 638378112. Its totient is φ = 627178272.

The previous prime is 632778161. The next prime is 632778241. The reversal of 632778191 is 191877236.

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

It is a cyclic number.

It is not a de Polignac number, because 632778191 - 2¹⁸ = 632516047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (632778151) 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, 2799791 + ... + 2800016.

It is an arithmetic number, because the mean of its divisors is an integer number (159594528).

Almost surely, 2^632778191 is an apocalyptic number.

632778191 is a deficient number, since it is larger than the sum of its proper divisors (5599921).

632778191 is a wasteful number, since it uses less digits than its factorization.

632778191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5599920.

The product of its digits is 127008, while the sum is 44.

The square root of 632778191 is about 25155.0828064628. The cubic root of 632778191 is about 858.5201659799.

The spelling of 632778191 in words is "six hundred thirty-two million, seven hundred seventy-eight thousand, one hundred ninety-one".