1121145521 has 4 divisors (see below), whose sum is σ = 1180153200. Its totient is φ = 1062137844.

The previous prime is 1121145499. The next prime is 1121145569. The reversal of 1121145521 is 1255411211.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1121145521 - 2⁶ = 1121145457 is a prime.

It is a super-2 number, since 2×1121145521² = 2513934558516722882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1121145581) 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, 29503811 + ... + 29503848.

It is an arithmetic number, because the mean of its divisors is an integer number (295038300).

Almost surely, 2^1121145521 is an apocalyptic number.

It is an amenable number.

1121145521 is a deficient number, since it is larger than the sum of its proper divisors (59007679).

1121145521 is an equidigital number, since it uses as much as digits as its factorization.

1121145521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59007678.

The product of its digits is 400, while the sum is 23.

The square root of 1121145521 is about 33483.5111808783. The cubic root of 1121145521 is about 1038.8527539598.

Adding to 1121145521 its reverse (1255411211), we get a palindrome (2376556732).

The spelling of 1121145521 in words is "one billion, one hundred twenty-one million, one hundred forty-five thousand, five hundred twenty-one".