1153551521 has 2 divisors, whose sum is σ = 1153551522. Its totient is φ = 1153551520.

The previous prime is 1153551491. The next prime is 1153551533. The reversal of 1153551521 is 1251553511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1104831121 + 48720400 = 33239^2 + 6980^2 .

It is a cyclic number.

It is not a de Polignac number, because 1153551521 - 2⁶ = 1153551457 is a prime.

It is a super-2 number, since 2×1153551521² = 2661362223202826882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1153551551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 576775760 + 576775761.

It is an arithmetic number, because the mean of its divisors is an integer number (576775761).

Almost surely, 2^1153551521 is an apocalyptic number.

It is an amenable number.

1153551521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1153551521 is an equidigital number, since it uses as much as digits as its factorization.

1153551521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3750, while the sum is 29.

The square root of 1153551521 is about 33963.9738693811. The cubic root of 1153551521 is about 1048.7669640772.

The spelling of 1153551521 in words is "one billion, one hundred fifty-three million, five hundred fifty-one thousand, five hundred twenty-one".