1121720534 has 16 divisors (see below), whose sum is σ = 1915349760. Its totient is φ = 487704360.

The previous prime is 1121720519. The next prime is 1121720539. The reversal of 1121720534 is 4350271211.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121720539) 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, 1107914 + ... + 1108925.

It is an arithmetic number, because the mean of its divisors is an integer number (119709360).

Almost surely, 2^1121720534 is an apocalyptic number.

1121720534 is a deficient number, since it is larger than the sum of its proper divisors (793629226).

1121720534 is a wasteful number, since it uses less digits than its factorization.

1121720534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2216875.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 1121720534 is about 33492.0965900912. The cubic root of 1121720534 is about 1039.0303258369.

Adding to 1121720534 its reverse (4350271211), we get a palindrome (5471991745).

The spelling of 1121720534 in words is "one billion, one hundred twenty-one million, seven hundred twenty thousand, five hundred thirty-four".