491523701 has 4 divisors (see below), whose sum is σ = 497745600. Its totient is φ = 485301804.

The previous prime is 491523677. The next prime is 491523709. The reversal of 491523701 is 107325194.

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 a de Polignac number, because none of the positive numbers 2^k-491523701 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 (491523709) 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, 3110831 + ... + 3110988.

It is an arithmetic number, because the mean of its divisors is an integer number (124436400).

Almost surely, 2^491523701 is an apocalyptic number.

It is an amenable number.

491523701 is a deficient number, since it is larger than the sum of its proper divisors (6221899).

491523701 is an equidigital number, since it uses as much as digits as its factorization.

491523701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6221898.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 491523701 is about 22170.3338044333. Note that the first 3 decimals coincide. The cubic root of 491523701 is about 789.1898445644.

Adding to 491523701 its reverse (107325194), we get a palindrome (598848895).

The spelling of 491523701 in words is "four hundred ninety-one million, five hundred twenty-three thousand, seven hundred one".