1121205761 has 4 divisors (see below), whose sum is σ = 1207452372. Its totient is φ = 1034959152.

The previous prime is 1121205739. The next prime is 1121205763. The reversal of 1121205761 is 1675021211.

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

It can be written as a sum of positive squares in 2 ways, for example, as 483340225 + 637865536 = 21985^2 + 25256^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121205761 is a prime.

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 1121205761.

It is not an unprimeable number, because it can be changed into a prime (1121205763) 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, 43123286 + ... + 43123311.

It is an arithmetic number, because the mean of its divisors is an integer number (301863093).

Almost surely, 2^1121205761 is an apocalyptic number.

It is an amenable number.

1121205761 is a deficient number, since it is larger than the sum of its proper divisors (86246611).

1121205761 is an equidigital number, since it uses as much as digits as its factorization.

1121205761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86246610.

The product of its (nonzero) digits is 840, while the sum is 26.

The square root of 1121205761 is about 33484.4107160332. The cubic root of 1121205761 is about 1038.8713597423.

Adding to 1121205761 its reverse (1675021211), we get a palindrome (2796226972).

The spelling of 1121205761 in words is "one billion, one hundred twenty-one million, two hundred five thousand, seven hundred sixty-one".