1156021047 has 12 divisors (see below), whose sum is σ = 1757693080. Its totient is φ = 730118448.

The previous prime is 1156021033. The next prime is 1156021057. The reversal of 1156021047 is 7401206511.

It is a happy number.

1156021047 is a `hidden beast` number, since 1 + 1 + 5 + 602 + 10 + 47 = 666.

It is not a de Polignac number, because 1156021047 - 2¹⁰ = 1156020023 is a prime.

It is a super-2 number, since 2×1156021047² = 2672769322213952418, 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 1156021047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156021057) 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 11 ways as a sum of consecutive naturals, for example, 3380008 + ... + 3380349.

Almost surely, 2^1156021047 is an apocalyptic number.

1156021047 is a deficient number, since it is larger than the sum of its proper divisors (601672033).

1156021047 is a wasteful number, since it uses less digits than its factorization.

1156021047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6760382 (or 6760379 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 1156021047 is about 34000.3095132971. The cubic root of 1156021047 is about 1049.5148316375.

Adding to 1156021047 its reverse (7401206511), we get a palindrome (8557227558).

The spelling of 1156021047 in words is "one billion, one hundred fifty-six million, twenty-one thousand, forty-seven".