1121990763 has 18 divisors (see below), whose sum is σ = 1520755516. Its totient is φ = 735810272.

The previous prime is 1121990759. The next prime is 1121990783. The reversal of 1121990763 is 3670991211.

It is a happy number.

It is not a de Polignac number, because 1121990763 - 2² = 1121990759 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121990713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4815295 + ... + 4815527.

Almost surely, 2^1121990763 is an apocalyptic number.

1121990763 is a deficient number, since it is larger than the sum of its proper divisors (398764753).

1121990763 is an frugal number, since it uses more digits than its factorization.

1121990763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635 (or 319 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 39.

The square root of 1121990763 is about 33496.1305675745. The cubic root of 1121990763 is about 1039.1137552871.

The spelling of 1121990763 in words is "one billion, one hundred twenty-one million, nine hundred ninety thousand, seven hundred sixty-three".