1155321401 has 32 divisors (see below), whose sum is σ = 1332495360. Its totient is φ = 994017024.

The previous prime is 1155321383. The next prime is 1155321403. The reversal of 1155321401 is 1041235511.

It is not a de Polignac number, because 1155321401 - 2²⁶ = 1088212537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155321403) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1338296 + ... + 1339158.

It is an arithmetic number, because the mean of its divisors is an integer number (41640480).

Almost surely, 2^1155321401 is an apocalyptic number.

It is an amenable number.

1155321401 is a deficient number, since it is larger than the sum of its proper divisors (177173959).

1155321401 is a wasteful number, since it uses less digits than its factorization.

1155321401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 1155321401 is about 33990.0191379764. The cubic root of 1155321401 is about 1049.3030601071.

Adding to 1155321401 its reverse (1041235511), we get a palindrome (2196556912).

The spelling of 1155321401 in words is "one billion, one hundred fifty-five million, three hundred twenty-one thousand, four hundred one".