1155402553 has 4 divisors (see below), whose sum is σ = 1155542608. Its totient is φ = 1155262500.

The previous prime is 1155402511. The next prime is 1155402583. The reversal of 1155402553 is 3552045511.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3552045511 = 7 ⋅507435073.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1155402553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155402583) 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, 56823 + ... + 74428.

It is an arithmetic number, because the mean of its divisors is an integer number (288885652).

Almost surely, 2^1155402553 is an apocalyptic number.

It is an amenable number.

1155402553 is a deficient number, since it is larger than the sum of its proper divisors (140055).

1155402553 is an equidigital number, since it uses as much as digits as its factorization.

1155402553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140054.

The product of its (nonzero) digits is 15000, while the sum is 31.

The square root of 1155402553 is about 33991.2128792134. The cubic root of 1155402553 is about 1049.3276278877.

The spelling of 1155402553 in words is "one billion, one hundred fifty-five million, four hundred two thousand, five hundred fifty-three".