1001272155 has 16 divisors (see below), whose sum is σ = 1725269280. Its totient is φ = 492933888.

The previous prime is 1001272109. The next prime is 1001272159. The reversal of 1001272155 is 5512721001.

It is not a de Polignac number, because 1001272155 - 2¹⁴ = 1001255771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1001272159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2567170 + ... + 2567559.

It is an arithmetic number, because the mean of its divisors is an integer number (107829330).

Almost surely, 2^1001272155 is an apocalyptic number.

1001272155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1001272155 is a deficient number, since it is larger than the sum of its proper divisors (723997125).

1001272155 is a wasteful number, since it uses less digits than its factorization.

1001272155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5134750.

The product of its (nonzero) digits is 700, while the sum is 24.

The square root of 1001272155 is about 31642.8847452314. The cubic root of 1001272155 is about 1000.4238719738.

Adding to 1001272155 its reverse (5512721001), we get a palindrome (6513993156).

The spelling of 1001272155 in words is "one billion, one million, two hundred seventy-two thousand, one hundred fifty-five".