1123031261 has 4 divisors (see below), whose sum is σ = 1225125024. Its totient is φ = 1020937500.

The previous prime is 1123031209. The next prime is 1123031323. The reversal of 1123031261 is 1621303211.

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 not a de Polignac number, because 1123031261 - 2¹⁸ = 1122769117 is a prime.

It is a super-2 number, since 2×1123031261² = 2522398426366500242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123031561) 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, 51046865 + ... + 51046886.

It is an arithmetic number, because the mean of its divisors is an integer number (306281256).

Almost surely, 2^1123031261 is an apocalyptic number.

1123031261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1123031261 is a deficient number, since it is larger than the sum of its proper divisors (102093763).

1123031261 is a wasteful number, since it uses less digits than its factorization.

1123031261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102093762.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1123031261 is about 33511.6585832453. The cubic root of 1123031261 is about 1039.4348695570.

Adding to 1123031261 its reverse (1621303211), we get a palindrome (2744334472).

The spelling of 1123031261 in words is "one billion, one hundred twenty-three million, thirty-one thousand, two hundred sixty-one".