1228435531 has 2 divisors, whose sum is σ = 1228435532. Its totient is φ = 1228435530.

The previous prime is 1228435529. The next prime is 1228435603. The reversal of 1228435531 is 1355348221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1228435531 - 2¹ = 1228435529 is a prime.

It is a super-2 number, since 2×1228435531² = 3018107707646503922, which contains 22 as substring.

Together with 1228435529, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1228435931) 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 as a sum of consecutive naturals, namely, 614217765 + 614217766.

It is an arithmetic number, because the mean of its divisors is an integer number (614217766).

Almost surely, 2^1228435531 is an apocalyptic number.

1228435531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228435531 is an equidigital number, since it uses as much as digits as its factorization.

1228435531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 34.

The square root of 1228435531 is about 35049.0446517448. The cubic root of 1228435531 is about 1070.9868122823.

The spelling of 1228435531 in words is "one billion, two hundred twenty-eight million, four hundred thirty-five thousand, five hundred thirty-one".