1155534401 has 4 divisors (see below), whose sum is σ = 1320610752. Its totient is φ = 990458052.

The previous prime is 1155534389. The next prime is 1155534403. The reversal of 1155534401 is 1044355511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1155534401 - 2⁶ = 1155534337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155534403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82538165 + ... + 82538178.

It is an arithmetic number, because the mean of its divisors is an integer number (330152688).

Almost surely, 2^1155534401 is an apocalyptic number.

It is an amenable number.

1155534401 is a deficient number, since it is larger than the sum of its proper divisors (165076351).

1155534401 is an equidigital number, since it uses as much as digits as its factorization.

1155534401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165076350.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 1155534401 is about 33993.1522663021. The cubic root of 1155534401 is about 1049.3675408128.

Adding to 1155534401 its reverse (1044355511), we get a palindrome (2199889912).

The spelling of 1155534401 in words is "one billion, one hundred fifty-five million, five hundred thirty-four thousand, four hundred one".