491401389 has 8 divisors (see below), whose sum is σ = 689686240. Its totient is φ = 310358736.

The previous prime is 491401387. The next prime is 491401397. The reversal of 491401389 is 983104194.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 491401389 - 2¹ = 491401387 is a prime.

It is a super-2 number, since 2×491401389² = 482950650222258642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491401387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4310482 + ... + 4310595.

It is an arithmetic number, because the mean of its divisors is an integer number (86210780).

Almost surely, 2^491401389 is an apocalyptic number.

It is an amenable number.

491401389 is a deficient number, since it is larger than the sum of its proper divisors (198284851).

491401389 is a wasteful number, since it uses less digits than its factorization.

491401389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8621099.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 491401389 is about 22167.5751718586. The cubic root of 491401389 is about 789.1243778020.

The spelling of 491401389 in words is "four hundred ninety-one million, four hundred one thousand, three hundred eighty-nine".