1156455261 has 12 divisors (see below), whose sum is σ = 1798930588. Its totient is φ = 711664704.

The previous prime is 1156455259. The next prime is 1156455281. The reversal of 1156455261 is 1625546511.

1156455261 is a `hidden beast` number, since 1 + 1 + 5 + 645 + 5 + 2 + 6 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 314352900 + 842102361 = 17730^2 + 29019^2 .

It is not a de Polignac number, because 1156455261 - 2¹ = 1156455259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156455211) 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 11 ways as a sum of consecutive naturals, for example, 4942000 + ... + 4942233.

Almost surely, 2^1156455261 is an apocalyptic number.

It is an amenable number.

1156455261 is a deficient number, since it is larger than the sum of its proper divisors (642475327).

1156455261 is a wasteful number, since it uses less digits than its factorization.

1156455261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9884252 (or 9884249 counting only the distinct ones).

The product of its digits is 36000, while the sum is 36.

The square root of 1156455261 is about 34006.6943556706. The cubic root of 1156455261 is about 1049.6462182269.

The spelling of 1156455261 in words is "one billion, one hundred fifty-six million, four hundred fifty-five thousand, two hundred sixty-one".