1252543216 has 20 divisors (see below), whose sum is σ = 2483241112. Its totient is φ = 611706816.

The previous prime is 1252543207. The next prime is 1252543219. The reversal of 1252543216 is 6123452521.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1252543219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 909591 + ... + 910966.

Almost surely, 2^1252543216 is an apocalyptic number.

1252543216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1252543216 is a deficient number, since it is larger than the sum of its proper divisors (1230697896).

1252543216 is a wasteful number, since it uses less digits than its factorization.

1252543216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820608 (or 1820602 counting only the distinct ones).

The product of its digits is 14400, while the sum is 31.

The square root of 1252543216 is about 35391.2872893880. The cubic root of 1252543216 is about 1077.9474091533.

Adding to 1252543216 its reverse (6123452521), we get a palindrome (7375995737).

The spelling of 1252543216 in words is "one billion, two hundred fifty-two million, five hundred forty-three thousand, two hundred sixteen".