121504531 has 4 divisors (see below), whose sum is σ = 125424064. Its totient is φ = 117585000.

The previous prime is 121504489. The next prime is 121504543. The reversal of 121504531 is 135405121.

It is a happy number.

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 121504531 - 2¹¹ = 121502483 is a prime.

It is a super-2 number, since 2×121504531² = 29526702107059922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121504571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1959720 + ... + 1959781.

It is an arithmetic number, because the mean of its divisors is an integer number (31356016).

Almost surely, 2^121504531 is an apocalyptic number.

121504531 is the 6972-nd centered pentagonal number.

121504531 is a deficient number, since it is larger than the sum of its proper divisors (3919533).

121504531 is an equidigital number, since it uses as much as digits as its factorization.

121504531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3919532.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 121504531 is about 11022.9093709420. The cubic root of 121504531 is about 495.2952440611.

Adding to 121504531 its reverse (135405121), we get a palindrome (256909652).

The spelling of 121504531 in words is "one hundred twenty-one million, five hundred four thousand, five hundred thirty-one".