309485491 has 8 divisors (see below), whose sum is σ = 361923584. Its totient is φ = 259103880.

The previous prime is 309485467. The next prime is 309485531. The reversal of 309485491 is 194584903.

It is a happy number.

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

It is not a de Polignac number, because 309485491 - 2¹¹ = 309483443 is a prime.

It is a super-2 number, since 2×309485491² = 191562538279022162, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (309482491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 513795 + ... + 514396.

It is an arithmetic number, because the mean of its divisors is an integer number (45240448).

Almost surely, 2^309485491 is an apocalyptic number.

309485491 is a deficient number, since it is larger than the sum of its proper divisors (52438093).

309485491 is a wasteful number, since it uses less digits than its factorization.

309485491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1028241.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 309485491 is about 17592.1997203306. The cubic root of 309485491 is about 676.4153136619.

The spelling of 309485491 in words is "three hundred nine million, four hundred eighty-five thousand, four hundred ninety-one".