1252001555 has 32 divisors (see below), whose sum is σ = 1746403200. Its totient is φ = 843955200.

The previous prime is 1252001549. The next prime is 1252001579. The reversal of 1252001555 is 5551002521.

It is not a de Polignac number, because 1252001555 - 2¹⁰ = 1252000531 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 525527 + ... + 527903.

It is an arithmetic number, because the mean of its divisors is an integer number (54575100).

Almost surely, 2^1252001555 is an apocalyptic number.

1252001555 is a deficient number, since it is larger than the sum of its proper divisors (494401645).

1252001555 is a wasteful number, since it uses less digits than its factorization.

1252001555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2639.

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 1252001555 is about 35383.6339993506. The cubic root of 1252001555 is about 1077.7920010070.

The spelling of 1252001555 in words is "one billion, two hundred fifty-two million, one thousand, five hundred fifty-five".