1121554433531 has 16 divisors (see below), whose sum is σ = 1292138016768. Its totient is φ = 953589753600.

The previous prime is 1121554433513. The next prime is 1121554433579. The reversal of 1121554433531 is 1353344551211.

It is a cyclic number.

It is not a de Polignac number, because 1121554433531 - 2²⁶ = 1121487324667 is a prime.

It is a super-2 number, since 2×1121554433531² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121554433581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 716225 + ... + 1660146.

It is an arithmetic number, because the mean of its divisors is an integer number (80758626048).

Almost surely, 2^{1121554433531} is an apocalyptic number.

1121554433531 is a deficient number, since it is larger than the sum of its proper divisors (170583583237).

1121554433531 is a wasteful number, since it uses less digits than its factorization.

1121554433531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2376922.

The product of its digits is 108000, while the sum is 38.

Adding to 1121554433531 its reverse (1353344551211), we get a palindrome (2474898984742).

The spelling of 1121554433531 in words is "one trillion, one hundred twenty-one billion, five hundred fifty-four million, four hundred thirty-three thousand, five hundred thirty-one".