1156271605 has 4 divisors (see below), whose sum is σ = 1387525932. Its totient is φ = 925017280.

The previous prime is 1156271593. The next prime is 1156271647. The reversal of 1156271605 is 5061726511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5061726511 = 2243 ⋅2256677.

It can be written as a sum of positive squares in 2 ways, for example, as 364580836 + 791690769 = 19094^2 + 28137^2 .

It is not a de Polignac number, because 1156271605 - 2¹⁷ = 1156140533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115627156 + ... + 115627165.

It is an arithmetic number, because the mean of its divisors is an integer number (346881483).

Almost surely, 2^1156271605 is an apocalyptic number.

It is an amenable number.

1156271605 is a deficient number, since it is larger than the sum of its proper divisors (231254327).

1156271605 is an equidigital number, since it uses as much as digits as its factorization.

1156271605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231254326.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 1156271605 is about 34003.9939565928. The cubic root of 1156271605 is about 1049.5906507129.

The spelling of 1156271605 in words is "one billion, one hundred fifty-six million, two hundred seventy-one thousand, six hundred five".