491400101 has 4 divisors (see below), whose sum is σ = 492093900. Its totient is φ = 490706304.

The previous prime is 491400073. The next prime is 491400103. The reversal of 491400101 is 101004194.

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

It can be written as a sum of positive squares in 2 ways, for example, as 242549476 + 248850625 = 15574^2 + 15775^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491400101 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 (491400103) 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, 345836 + ... + 347253.

It is an arithmetic number, because the mean of its divisors is an integer number (123023475).

Almost surely, 2^491400101 is an apocalyptic number.

It is an amenable number.

491400101 is a deficient number, since it is larger than the sum of its proper divisors (693799).

491400101 is an equidigital number, since it uses as much as digits as its factorization.

491400101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693798.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 491400101 is about 22167.5461203986. The cubic root of 491400101 is about 789.1236883499.

Adding to 491400101 its reverse (101004194), we get a palindrome (592404295).

The spelling of 491400101 in words is "four hundred ninety-one million, four hundred thousand, one hundred one".