1243512161 has 8 divisors (see below), whose sum is σ = 1275089760. Its totient is φ = 1212317568.

The previous prime is 1243512119. The next prime is 1243512187. The reversal of 1243512161 is 1612153421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1243512161 - 2⁶ = 1243512097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1243512161.

It is not an unprimeable number, because it can be changed into a prime (1243512191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89171 + ... + 102168.

It is an arithmetic number, because the mean of its divisors is an integer number (159386220).

Almost surely, 2^1243512161 is an apocalyptic number.

It is an amenable number.

1243512161 is a deficient number, since it is larger than the sum of its proper divisors (31577599).

1243512161 is an equidigital number, since it uses as much as digits as its factorization.

1243512161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191503.

The product of its digits is 1440, while the sum is 26.

The square root of 1243512161 is about 35263.4677960067. The cubic root of 1243512161 is about 1075.3504279583.

Adding to 1243512161 its reverse (1612153421), we get a palindrome (2855665582).

The spelling of 1243512161 in words is "one billion, two hundred forty-three million, five hundred twelve thousand, one hundred sixty-one".