121541531 has 4 divisors (see below), whose sum is σ = 121570752. Its totient is φ = 121512312.

The previous prime is 121541509. The next prime is 121541543. The reversal of 121541531 is 135145121.

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

It is a cyclic number.

It is not a de Polignac number, because 121541531 - 2²² = 117347227 is a prime.

It is a super-2 number, since 2×121541531² = 29544687515647922, 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 = 121541497 and 121541506.

It is not an unprimeable number, because it can be changed into a prime (121541501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7076 + ... + 17121.

It is an arithmetic number, because the mean of its divisors is an integer number (30392688).

Almost surely, 2^121541531 is an apocalyptic number.

121541531 is a deficient number, since it is larger than the sum of its proper divisors (29221).

121541531 is an equidigital number, since it uses as much as digits as its factorization.

121541531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29220.

The product of its digits is 600, while the sum is 23.

The square root of 121541531 is about 11024.5875659818. The cubic root of 121541531 is about 495.3455139674.

Adding to 121541531 its reverse (135145121), we get a palindrome (256686652).

The spelling of 121541531 in words is "one hundred twenty-one million, five hundred forty-one thousand, five hundred thirty-one".