1161856741 has 4 divisors (see below), whose sum is σ = 1162767852. Its totient is φ = 1160945632.

The previous prime is 1161856739. The next prime is 1161856763. The reversal of 1161856741 is 1476581611.

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: 1476581611 = 27481 ⋅53731.

It can be written as a sum of positive squares in 2 ways, for example, as 867597025 + 294259716 = 29455^2 + 17154^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161856741 - 2¹ = 1161856739 is a prime.

It is a super-2 number, since 2×1161856741² = 2699822173214282162, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1161856694 and 1161856703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161856711) 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, 453640 + ... + 456193.

It is an arithmetic number, because the mean of its divisors is an integer number (290691963).

Almost surely, 2^1161856741 is an apocalyptic number.

It is an amenable number.

1161856741 is a deficient number, since it is larger than the sum of its proper divisors (911111).

1161856741 is an equidigital number, since it uses as much as digits as its factorization.

1161856741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911110.

The product of its digits is 40320, while the sum is 40.

The square root of 1161856741 is about 34086.0197295020. The cubic root of 1161856741 is about 1051.2778820916.

The spelling of 1161856741 in words is "one billion, one hundred sixty-one million, eight hundred fifty-six thousand, seven hundred forty-one".