491209031 has 8 divisors (see below), whose sum is σ = 493665744. Its totient is φ = 488759040.

The previous prime is 491209021. The next prime is 491209049. The reversal of 491209031 is 130902194.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 491209031 - 2⁶ = 491208967 is a prime.

It is a super-2 number, since 2×491209031² = 482572624271917922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 491208985 and 491209003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491209001) 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, 200345 + ... + 202781.

It is an arithmetic number, because the mean of its divisors is an integer number (61708218).

Almost surely, 2^491209031 is an apocalyptic number.

491209031 is a deficient number, since it is larger than the sum of its proper divisors (2456713).

491209031 is a wasteful number, since it uses less digits than its factorization.

491209031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3361.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 491209031 is about 22163.2360227472. The cubic root of 491209031 is about 789.0213973592.

The spelling of 491209031 in words is "four hundred ninety-one million, two hundred nine thousand, thirty-one".