1153531531 has 2 divisors, whose sum is σ = 1153531532. Its totient is φ = 1153531530.

The previous prime is 1153531513. The next prime is 1153531541. The reversal of 1153531531 is 1351353511.

Together with previous prime (1153531513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1153531531 - 2¹¹ = 1153529483 is a prime.

It is a super-2 number, since 2×1153531531² = 2661269986022407922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1153531531.

It is not a weakly prime, because it can be changed into another prime (1153531541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 576765765 + 576765766.

It is an arithmetic number, because the mean of its divisors is an integer number (576765766).

Almost surely, 2^1153531531 is an apocalyptic number.

1153531531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1153531531 is an equidigital number, since it uses as much as digits as its factorization.

1153531531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3375, while the sum is 28.

The square root of 1153531531 is about 33963.6795856986. The cubic root of 1153531531 is about 1048.7609059826.

The spelling of 1153531531 in words is "one billion, one hundred fifty-three million, five hundred thirty-one thousand, five hundred thirty-one".