491040001 has 2 divisors, whose sum is σ = 491040002. Its totient is φ = 491040000.

The previous prime is 491039999. The next prime is 491040029. The reversal of 491040001 is 100040194.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 367718976 + 123321025 = 19176^2 + 11105^2 .

It is a cyclic number.

It is not a de Polignac number, because 491040001 - 2¹ = 491039999 is a prime.

It is a super-2 number, since 2×491040001² = 482240565164160002, which contains 22 as substring.

Together with 491039999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (491040101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245520000 + 245520001.

It is an arithmetic number, because the mean of its divisors is an integer number (245520001).

Almost surely, 2^491040001 is an apocalyptic number.

It is an amenable number.

491040001 is a deficient number, since it is larger than the sum of its proper divisors (1).

491040001 is an equidigital number, since it uses as much as digits as its factorization.

491040001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 491040001 is about 22159.4223977070. The cubic root of 491040001 is about 788.9308835595.

Adding to 491040001 its reverse (100040194), we get a palindrome (591080195).

The spelling of 491040001 in words is "four hundred ninety-one million, forty thousand, one".