1121788531 has 4 divisors (see below), whose sum is σ = 1123803072. Its totient is φ = 1119773992.

The previous prime is 1121788529. The next prime is 1121788541. The reversal of 1121788531 is 1358871211.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1358871211 = 23 ⋅59081357.

It is a cyclic number.

It is not a de Polignac number, because 1121788531 - 2¹ = 1121788529 is a prime.

It is a super-2 number, since 2×1121788531² = 2516819016566275922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121788541) 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, 1006435 + ... + 1007548.

It is an arithmetic number, because the mean of its divisors is an integer number (280950768).

Almost surely, 2^1121788531 is an apocalyptic number.

1121788531 is a deficient number, since it is larger than the sum of its proper divisors (2014541).

1121788531 is an equidigital number, since it uses as much as digits as its factorization.

1121788531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2014540.

The product of its digits is 13440, while the sum is 37.

The square root of 1121788531 is about 33493.1116947948. Note that the first 3 decimals coincide. The cubic root of 1121788531 is about 1039.0513202276.

The spelling of 1121788531 in words is "one billion, one hundred twenty-one million, seven hundred eighty-eight thousand, five hundred thirty-one".