491071898 has 8 divisors (see below), whose sum is σ = 743901300. Its totient is φ = 243104800.

The previous prime is 491071879. The next prime is 491071901. The reversal of 491071898 is 898170194.

It can be written as a sum of positive squares in 2 ways, for example, as 407111329 + 83960569 = 20177^2 + 9163^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1215323 + ... + 1215726.

Almost surely, 2^491071898 is an apocalyptic number.

491071898 is a deficient number, since it is larger than the sum of its proper divisors (252829402).

491071898 is a wasteful number, since it uses less digits than its factorization.

491071898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2431152.

The product of its (nonzero) digits is 145152, while the sum is 47.

The square root of 491071898 is about 22160.1421024325. The cubic root of 491071898 is about 788.9479656597.

The spelling of 491071898 in words is "four hundred ninety-one million, seventy-one thousand, eight hundred ninety-eight".