1161340031 has 4 divisors (see below), whose sum is σ = 1162866864. Its totient is φ = 1159813200.

The previous prime is 1161340027. The next prime is 1161340039. The reversal of 1161340031 is 1300431611.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1161340031 - 2² = 1161340027 is a prime.

It is a super-2 number, since 2×1161340031² = 2697421335206161922, 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 = 1161339985 and 1161340012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161340039) 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, 762275 + ... + 763796.

It is an arithmetic number, because the mean of its divisors is an integer number (290716716).

Almost surely, 2^1161340031 is an apocalyptic number.

1161340031 is a deficient number, since it is larger than the sum of its proper divisors (1526833).

1161340031 is an equidigital number, since it uses as much as digits as its factorization.

1161340031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1526832.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1161340031 is about 34078.4393862160. The cubic root of 1161340031 is about 1051.1220148143.

Adding to 1161340031 its reverse (1300431611), we get a palindrome (2461771642).

The spelling of 1161340031 in words is "one billion, one hundred sixty-one million, three hundred forty thousand, thirty-one".