1155681071 has 4 divisors (see below), whose sum is σ = 1159011912. Its totient is φ = 1152350232.

The previous prime is 1155681053. The next prime is 1155681091. The reversal of 1155681071 is 1701865511.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1701865511 = 19 ⋅89571869.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1155681071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155681011) 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, 1664900 + ... + 1665593.

It is an arithmetic number, because the mean of its divisors is an integer number (289752978).

Almost surely, 2^1155681071 is an apocalyptic number.

1155681071 is a deficient number, since it is larger than the sum of its proper divisors (3330841).

1155681071 is an equidigital number, since it uses as much as digits as its factorization.

1155681071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3330840.

The product of its (nonzero) digits is 8400, while the sum is 35.

The square root of 1155681071 is about 33995.3095441121. The cubic root of 1155681071 is about 1049.4119370753.

The spelling of 1155681071 in words is "one billion, one hundred fifty-five million, six hundred eighty-one thousand, seventy-one".