1121861765 has 8 divisors (see below), whose sum is σ = 1347075360. Its totient is φ = 896928592.

The previous prime is 1121861761. The next prime is 1121861771. The reversal of 1121861765 is 5671681211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1121861765 - 2² = 1121861761 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121861761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61199 + ... + 77388.

It is an arithmetic number, because the mean of its divisors is an integer number (168384420).

Almost surely, 2^1121861765 is an apocalyptic number.

It is an amenable number.

1121861765 is a deficient number, since it is larger than the sum of its proper divisors (225213595).

1121861765 is a wasteful number, since it uses less digits than its factorization.

1121861765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140211.

The product of its digits is 20160, while the sum is 38.

The square root of 1121861765 is about 33494.2049465277. The cubic root of 1121861765 is about 1039.0739306177.

The spelling of 1121861765 in words is "one billion, one hundred twenty-one million, eight hundred sixty-one thousand, seven hundred sixty-five".