491727501 has 6 divisors (see below), whose sum is σ = 710273070. Its totient is φ = 327818328.

The previous prime is 491727497. The next prime is 491727503. The reversal of 491727501 is 105727194.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 249956100 + 241771401 = 15810^2 + 15549^2 .

It is not a de Polignac number, because 491727501 - 2² = 491727497 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491727503) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27318186 + ... + 27318203.

It is an arithmetic number, because the mean of its divisors is an integer number (118378845).

Almost surely, 2^491727501 is an apocalyptic number.

It is an amenable number.

491727501 is a deficient number, since it is larger than the sum of its proper divisors (218545569).

491727501 is a wasteful number, since it uses less digits than its factorization.

491727501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54636395 (or 54636392 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

The square root of 491727501 is about 22174.9295602038. The cubic root of 491727501 is about 789.2989031686.

The spelling of 491727501 in words is "four hundred ninety-one million, seven hundred twenty-seven thousand, five hundred one".