1231155035 has 16 divisors (see below), whose sum is σ = 1625022432. Its totient is φ = 895380640.

The previous prime is 1231154999. The next prime is 1231155053. The reversal of 1231155035 is 5305511321.

It is a happy number.

It is not a de Polignac number, because 1231155035 - 2¹⁸ = 1230892891 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231154995 and 1231155013.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85844 + ... + 99153.

It is an arithmetic number, because the mean of its divisors is an integer number (101563902).

Almost surely, 2^1231155035 is an apocalyptic number.

1231155035 is a deficient number, since it is larger than the sum of its proper divisors (393867397).

1231155035 is an equidigital number, since it uses as much as digits as its factorization.

1231155035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185035 (or 185013 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 1231155035 is about 35087.8188977314. The cubic root of 1231155035 is about 1071.7765447567.

Adding to 1231155035 its reverse (5305511321), we get a palindrome (6536666356).

The spelling of 1231155035 in words is "one billion, two hundred thirty-one million, one hundred fifty-five thousand, thirty-five".