1121720827 has 4 divisors (see below), whose sum is σ = 1121863320. Its totient is φ = 1121578336.

The previous prime is 1121720813. The next prime is 1121720837. The reversal of 1121720827 is 7280271211.

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

It is a cyclic number.

It is not a de Polignac number, because 1121720827 - 2¹⁹ = 1121196539 is a prime.

It is a super-2 number, since 2×1121720827² = 2516515227451127858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121720837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58702 + ... + 75427.

It is an arithmetic number, because the mean of its divisors is an integer number (280465830).

Almost surely, 2^1121720827 is an apocalyptic number.

1121720827 is a deficient number, since it is larger than the sum of its proper divisors (142493).

1121720827 is an equidigital number, since it uses as much as digits as its factorization.

1121720827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142492.

The product of its (nonzero) digits is 3136, while the sum is 31.

The square root of 1121720827 is about 33492.1009642572. The cubic root of 1121720827 is about 1039.0304163039.

The spelling of 1121720827 in words is "one billion, one hundred twenty-one million, seven hundred twenty thousand, eight hundred twenty-seven".