1121651605 has 16 divisors (see below), whose sum is σ = 1422241920. Its totient is φ = 846842688.

The previous prime is 1121651593. The next prime is 1121651677. The reversal of 1121651605 is 5061561211.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1121651605 - 2²¹ = 1119554453 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2539 + ... + 47431.

It is an arithmetic number, because the mean of its divisors is an integer number (88890120).

Almost surely, 2^1121651605 is an apocalyptic number.

It is an amenable number.

1121651605 is a deficient number, since it is larger than the sum of its proper divisors (300590315).

1121651605 is a wasteful number, since it uses less digits than its factorization.

1121651605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45180.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 1121651605 is about 33491.0675404652. The cubic root of 1121651605 is about 1039.0090428209.

The spelling of 1121651605 in words is "one billion, one hundred twenty-one million, six hundred fifty-one thousand, six hundred five".