1001336491 has 4 divisors (see below), whose sum is σ = 1004206000. Its totient is φ = 998466984.

The previous prime is 1001336467. The next prime is 1001336519. The reversal of 1001336491 is 1946331001.

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

It is a cyclic number.

It is not a de Polignac number, because 1001336491 - 2⁵ = 1001336459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001336591) 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, 1434231 + ... + 1434928.

It is an arithmetic number, because the mean of its divisors is an integer number (251051500).

Almost surely, 2^1001336491 is an apocalyptic number.

1001336491 is a deficient number, since it is larger than the sum of its proper divisors (2869509).

1001336491 is an equidigital number, since it uses as much as digits as its factorization.

1001336491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2869508.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 1001336491 is about 31643.9013239518. The cubic root of 1001336491 is about 1000.4452986797.

Adding to 1001336491 its reverse (1946331001), we get a palindrome (2947667492).

The spelling of 1001336491 in words is "one billion, one million, three hundred thirty-six thousand, four hundred ninety-one".