1251155255 has 16 divisors (see below), whose sum is σ = 1740040704. Its totient is φ = 845849760.

The previous prime is 1251155251. The next prime is 1251155267. The reversal of 1251155255 is 5525511521.

It is not a de Polignac number, because 1251155255 - 2² = 1251155251 is a prime.

It is a super-2 number, since 2×1251155255² = 3130778944228230050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251155251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249257 + ... + 254226.

It is an arithmetic number, because the mean of its divisors is an integer number (108752544).

Almost surely, 2^1251155255 is an apocalyptic number.

1251155255 is a deficient number, since it is larger than the sum of its proper divisors (488885449).

1251155255 is an equidigital number, since it uses as much as digits as its factorization.

1251155255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503566.

The product of its digits is 12500, while the sum is 32.

The square root of 1251155255 is about 35371.6730591020. The cubic root of 1251155255 is about 1077.5490990272.

Adding to 1251155255 its reverse (5525511521), we get a palindrome (6776666776).

The spelling of 1251155255 in words is "one billion, two hundred fifty-one million, one hundred fifty-five thousand, two hundred fifty-five".