1255533101 has 4 divisors (see below), whose sum is σ = 1256827104. Its totient is φ = 1254239100.

The previous prime is 1255533061. The next prime is 1255533109. The reversal of 1255533101 is 1013355521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1255533101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255533109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 645545 + ... + 647486.

It is an arithmetic number, because the mean of its divisors is an integer number (314206776).

Almost surely, 2^1255533101 is an apocalyptic number.

It is an amenable number.

1255533101 is a deficient number, since it is larger than the sum of its proper divisors (1294003).

1255533101 is an equidigital number, since it uses as much as digits as its factorization.

1255533101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294002.

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 1255533101 is about 35433.5025223305. The cubic root of 1255533101 is about 1078.8044328747.

Adding to 1255533101 its reverse (1013355521), we get a palindrome (2268888622).

The spelling of 1255533101 in words is "one billion, two hundred fifty-five million, five hundred thirty-three thousand, one hundred one".