1251455555 has 16 divisors (see below), whose sum is σ = 1716906240. Its totient is φ = 857828832.

The previous prime is 1251455537. The next prime is 1251455567. The reversal of 1251455555 is 5555541521.

It is not a de Polignac number, because 1251455555 - 2¹⁴ = 1251439171 is a prime.

It is a super-2 number, since 2×1251455555² = 3132282012280716050, which contains 22 as substring.

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, 133616 + ... + 142674.

It is an arithmetic number, because the mean of its divisors is an integer number (107306640).

Almost surely, 2^1251455555 is an apocalyptic number.

1251455555 is a deficient number, since it is larger than the sum of its proper divisors (465450685).

1251455555 is an equidigital number, since it uses as much as digits as its factorization.

1251455555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13018.

The product of its digits is 125000, while the sum is 38.

The square root of 1251455555 is about 35375.9177266117. The cubic root of 1251455555 is about 1077.6353025865.

The spelling of 1251455555 in words is "one billion, two hundred fifty-one million, four hundred fifty-five thousand, five hundred fifty-five".