1128272581 has 4 divisors (see below), whose sum is σ = 1128387532. Its totient is φ = 1128157632.

The previous prime is 1128272527. The next prime is 1128272599. The reversal of 1128272581 is 1852728211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1852728211 = 31391 ⋅59021.

It can be written as a sum of positive squares in 2 ways, for example, as 225270081 + 903002500 = 15009^2 + 30050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1128272581 is a prime.

It is a super-2 number, since 2×1128272581² = 2545998034072803122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1128272581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128272501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41220 + ... + 62893.

It is an arithmetic number, because the mean of its divisors is an integer number (282096883).

Almost surely, 2^1128272581 is an apocalyptic number.

It is an amenable number.

1128272581 is a deficient number, since it is larger than the sum of its proper divisors (114951).

1128272581 is a wasteful number, since it uses less digits than its factorization.

1128272581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114950.

The product of its digits is 17920, while the sum is 37.

The square root of 1128272581 is about 33589.7689929538. The cubic root of 1128272581 is about 1041.0494156410.

The spelling of 1128272581 in words is "one billion, one hundred twenty-eight million, two hundred seventy-two thousand, five hundred eighty-one".