491370853 has 4 divisors (see below), whose sum is σ = 501825600. Its totient is φ = 480916108.

The previous prime is 491370833. The next prime is 491370899. The reversal of 491370853 is 358073194.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 491370853 - 2¹⁷ = 491239781 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 (491370823) 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, 5227303 + ... + 5227396.

It is an arithmetic number, because the mean of its divisors is an integer number (125456400).

Almost surely, 2^491370853 is an apocalyptic number.

It is an amenable number.

491370853 is a deficient number, since it is larger than the sum of its proper divisors (10454747).

491370853 is a wasteful number, since it uses less digits than its factorization.

491370853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10454746.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 491370853 is about 22166.8864074321. The cubic root of 491370853 is about 789.1080318970.

The spelling of 491370853 in words is "four hundred ninety-one million, three hundred seventy thousand, eight hundred fifty-three".