1228931 has 4 divisors (see below), whose sum is σ = 1340664. Its totient is φ = 1117200.

The previous prime is 1228919. The next prime is 1228937. The reversal of 1228931 is 1398221.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1228931 is a prime.

It is a super-2 number, since 2×1228931² = 3020542805522, 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 1228931.

It is not an unprimeable number, because it can be changed into a prime (1228937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55850 + ... + 55871.

It is an arithmetic number, because the mean of its divisors is an integer number (335166).

2^1228931 is an apocalyptic number.

1228931 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1228931 is a deficient number, since it is larger than the sum of its proper divisors (111733).

1228931 is a wasteful number, since it uses less digits than its factorization.

1228931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111732.

The product of its digits is 864, while the sum is 26.

The square root of 1228931 is about 1108.5716034610. The cubic root of 1228931 is about 107.1130781156.

The spelling of 1228931 in words is "one million, two hundred twenty-eight thousand, nine hundred thirty-one".