1228631 has 2 divisors, whose sum is σ = 1228632. Its totient is φ = 1228630.

The previous prime is 1228613. The next prime is 1228651. The reversal of 1228631 is 1368221.

Together with previous prime (1228613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1228631 - 2⁶ = 1228567 is a prime.

It is a super-2 number, since 2×1228631² = 3019068268322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1228597 and 1228606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1228651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614315 + 614316.

It is an arithmetic number, because the mean of its divisors is an integer number (614316).

2^1228631 is an apocalyptic number.

1228631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228631 is an equidigital number, since it uses as much as digits as its factorization.

1228631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 23.

The square root of 1228631 is about 1108.4362859452. The cubic root of 1228631 is about 107.1043614508.

The spelling of 1228631 in words is "one million, two hundred twenty-eight thousand, six hundred thirty-one".