1243149133 has 4 divisors (see below), whose sum is σ = 1243353888. Its totient is φ = 1242944380.

The previous prime is 1243149113. The next prime is 1243149137. The reversal of 1243149133 is 3319413421.

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: 3319413421 = 17 ⋅195259613.

It is a cyclic number.

It is not a de Polignac number, because 1243149133 - 2¹⁷ = 1243018061 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1243149095 and 1243149104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243149137) 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, 92983 + ... + 105508.

It is an arithmetic number, because the mean of its divisors is an integer number (310838472).

Almost surely, 2^1243149133 is an apocalyptic number.

It is an amenable number.

1243149133 is a deficient number, since it is larger than the sum of its proper divisors (204755).

1243149133 is an equidigital number, since it uses as much as digits as its factorization.

1243149133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204754.

The product of its digits is 7776, while the sum is 31.

The square root of 1243149133 is about 35258.3200535703. The cubic root of 1243149133 is about 1075.2457726862.

The spelling of 1243149133 in words is "one billion, two hundred forty-three million, one hundred forty-nine thousand, one hundred thirty-three".