1123149581 has 4 divisors (see below), whose sum is σ = 1123860672. Its totient is φ = 1122438492.

The previous prime is 1123149569. The next prime is 1123149589. The reversal of 1123149581 is 1859413211.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-1123149581 is a prime.

It is a super-2 number, since 2×1123149581² = 2522929962600951122, 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 (1123149589) 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, 353171 + ... + 356336.

It is an arithmetic number, because the mean of its divisors is an integer number (280965168).

Almost surely, 2^1123149581 is an apocalyptic number.

It is an amenable number.

1123149581 is a deficient number, since it is larger than the sum of its proper divisors (711091).

1123149581 is an equidigital number, since it uses as much as digits as its factorization.

1123149581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711090.

The product of its digits is 8640, while the sum is 35.

The square root of 1123149581 is about 33513.4238925240. The cubic root of 1123149581 is about 1039.4713724337.

The spelling of 1123149581 in words is "one billion, one hundred twenty-three million, one hundred forty-nine thousand, five hundred eighty-one".