1228657531 has 2 divisors, whose sum is σ = 1228657532. Its totient is φ = 1228657530.

The previous prime is 1228657487. The next prime is 1228657561. The reversal of 1228657531 is 1357568221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1228657531 - 2⁷ = 1228657403 is a prime.

It is a super-2 number, since 2×1228657531² = 3019198656966031922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1228657561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614328765 + 614328766.

It is an arithmetic number, because the mean of its divisors is an integer number (614328766).

Almost surely, 2^1228657531 is an apocalyptic number.

1228657531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228657531 is an equidigital number, since it uses as much as digits as its factorization.

1228657531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 40.

The square root of 1228657531 is about 35052.2114994190. The cubic root of 1228657531 is about 1071.0513238081.

The spelling of 1228657531 in words is "one billion, two hundred twenty-eight million, six hundred fifty-seven thousand, five hundred thirty-one".