491282378 has 4 divisors (see below), whose sum is σ = 736923570. Its totient is φ = 245641188.

The previous prime is 491282347. The next prime is 491282381. The reversal of 491282378 is 873282194.

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

It can be written as a sum of positive squares in only one way, i.e., 297321049 + 193961329 = 17243^2 + 13927^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122820593 + ... + 122820596.

Almost surely, 2^491282378 is an apocalyptic number.

491282378 is a deficient number, since it is larger than the sum of its proper divisors (245641192).

491282378 is a wasteful number, since it uses less digits than its factorization.

491282378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245641191.

The product of its digits is 193536, while the sum is 44.

The square root of 491282378 is about 22164.8906606823. The cubic root of 491282378 is about 789.0606674516.

The spelling of 491282378 in words is "four hundred ninety-one million, two hundred eighty-two thousand, three hundred seventy-eight".