121123531 has 4 divisors (see below), whose sum is σ = 121165600. Its totient is φ = 121081464.

The previous prime is 121123493. The next prime is 121123547. The reversal of 121123531 is 135321121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121123531 is a prime.

It is a super-2 number, since 2×121123531² = 29341819523815922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121123499 and 121123508.

It is not an unprimeable number, because it can be changed into a prime (121123031) 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, 16371 + ... + 22588.

It is an arithmetic number, because the mean of its divisors is an integer number (30291400).

Almost surely, 2^121123531 is an apocalyptic number.

121123531 is a deficient number, since it is larger than the sum of its proper divisors (42069).

121123531 is an equidigital number, since it uses as much as digits as its factorization.

121123531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42068.

The product of its digits is 180, while the sum is 19.

The square root of 121123531 is about 11005.6136130613. The cubic root of 121123531 is about 494.7770052947. Note that the first 3 decimals are identical.

Adding to 121123531 its reverse (135321121), we get a palindrome (256444652).

It can be divided in two parts, 1211 and 23531, that added together give a palindrome (24742).

The spelling of 121123531 in words is "one hundred twenty-one million, one hundred twenty-three thousand, five hundred thirty-one".