1243250161 has 4 divisors (see below), whose sum is σ = 1308684400. Its totient is φ = 1177815924.

The previous prime is 1243250159. The next prime is 1243250201. The reversal of 1243250161 is 1610523421.

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 not a de Polignac number, because 1243250161 - 2¹ = 1243250159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243251161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32717091 + ... + 32717128.

It is an arithmetic number, because the mean of its divisors is an integer number (327171100).

Almost surely, 2^1243250161 is an apocalyptic number.

It is an amenable number.

1243250161 is a deficient number, since it is larger than the sum of its proper divisors (65434239).

1243250161 is an equidigital number, since it uses as much as digits as its factorization.

1243250161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65434238.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1243250161 is about 35259.7527075843. The cubic root of 1243250161 is about 1075.2748995181.

Adding to 1243250161 its reverse (1610523421), we get a palindrome (2853773582).

The spelling of 1243250161 in words is "one billion, two hundred forty-three million, two hundred fifty thousand, one hundred sixty-one".