491997358 has 4 divisors (see below), whose sum is σ = 737996040. Its totient is φ = 245998678.

The previous prime is 491997353. The next prime is 491997409. The reversal of 491997358 is 853799194.

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

It is a super-2 number, since 2×491997358² = 484122800557960328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 491997299 and 491997308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491997353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122999338 + ... + 122999341.

It is an arithmetic number, because the mean of its divisors is an integer number (184499010).

Almost surely, 2^491997358 is an apocalyptic number.

491997358 is a deficient number, since it is larger than the sum of its proper divisors (245998682).

491997358 is a wasteful number, since it uses less digits than its factorization.

491997358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245998681.

The product of its digits is 2449440, while the sum is 55.

The square root of 491997358 is about 22181.0134574595. The cubic root of 491997358 is about 789.4432642097.

The spelling of 491997358 in words is "four hundred ninety-one million, nine hundred ninety-seven thousand, three hundred fifty-eight".