312289381 has 8 divisors (see below), whose sum is σ = 322665984. Its totient is φ = 301931760.

The previous prime is 312289379. The next prime is 312289387. The reversal of 312289381 is 183982213.

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 312289381 - 2¹ = 312289379 is a prime.

It is a super-2 number, since 2×312289381² = 195049314970726322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 312289381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312289387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33795 + ... + 42031.

It is an arithmetic number, because the mean of its divisors is an integer number (40333248).

Almost surely, 2^312289381 is an apocalyptic number.

312289381 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

312289381 is a deficient number, since it is larger than the sum of its proper divisors (10376603).

312289381 is a wasteful number, since it uses less digits than its factorization.

312289381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9491.

The product of its digits is 20736, while the sum is 37.

The square root of 312289381 is about 17671.7113206390. The cubic root of 312289381 is about 678.4519144388.

The spelling of 312289381 in words is "three hundred twelve million, two hundred eighty-nine thousand, three hundred eighty-one".