1121561717 has 4 divisors (see below), whose sum is σ = 1121665440. Its totient is φ = 1121457996.

The previous prime is 1121561699. The next prime is 1121561729. The reversal of 1121561717 is 7171651211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7171651211 = 18379 ⋅390209.

It is a cyclic number.

It is not a de Polignac number, because 1121561717 - 2¹² = 1121557621 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 (1121561017) 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, 33467 + ... + 57992.

It is an arithmetic number, because the mean of its divisors is an integer number (280416360).

Almost surely, 2^1121561717 is an apocalyptic number.

It is an amenable number.

1121561717 is a deficient number, since it is larger than the sum of its proper divisors (103723).

1121561717 is an equidigital number, since it uses as much as digits as its factorization.

1121561717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103722.

The product of its digits is 2940, while the sum is 32.

The square root of 1121561717 is about 33489.7255438142. The cubic root of 1121561717 is about 1038.9812870426.

The spelling of 1121561717 in words is "one billion, one hundred twenty-one million, five hundred sixty-one thousand, seven hundred seventeen".