1243542115 has 24 divisors (see below), whose sum is σ = 1601754480. Its totient is φ = 926420544.

The previous prime is 1243542109. The next prime is 1243542133. The reversal of 1243542115 is 5112453421.

It is not a de Polignac number, because 1243542115 - 2⁷ = 1243541987 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 100657 + ... + 112333.

It is an arithmetic number, because the mean of its divisors is an integer number (66739770).

Almost surely, 2^1243542115 is an apocalyptic number.

1243542115 is a deficient number, since it is larger than the sum of its proper divisors (358212365).

1243542115 is a wasteful number, since it uses less digits than its factorization.

1243542115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11779 (or 11760 counting only the distinct ones).

The product of its digits is 4800, while the sum is 28.

The square root of 1243542115 is about 35263.8925106120. The cubic root of 1243542115 is about 1075.3590623164.

Adding to 1243542115 its reverse (5112453421), we get a palindrome (6355995536).

The spelling of 1243542115 in words is "one billion, two hundred forty-three million, five hundred forty-two thousand, one hundred fifteen".