1252543555 has 16 divisors (see below), whose sum is σ = 1584341280. Its totient is φ = 947987712.

The previous prime is 1252543543. The next prime is 1252543571. The reversal of 1252543555 is 5553452521.

It is a cyclic number.

It is not a de Polignac number, because 1252543555 - 2²¹ = 1250446403 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63207 + ... + 80623.

It is an arithmetic number, because the mean of its divisors is an integer number (99021330).

Almost surely, 2^1252543555 is an apocalyptic number.

1252543555 is a deficient number, since it is larger than the sum of its proper divisors (331797725).

1252543555 is a wasteful number, since it uses less digits than its factorization.

1252543555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18198.

The product of its digits is 150000, while the sum is 37.

The square root of 1252543555 is about 35391.2920787021. The cubic root of 1252543555 is about 1077.9475064019.

The spelling of 1252543555 in words is "one billion, two hundred fifty-two million, five hundred forty-three thousand, five hundred fifty-five".