121641533 has 8 divisors (see below), whose sum is σ = 134539608. Its totient is φ = 109249344.

The previous prime is 121641529. The next prime is 121641557. The reversal of 121641533 is 335146121.

121641533 = T₄₅₇ + T₄₅₈ + ... + T₉₃₇.

It can be written as a sum of positive squares in 4 ways, for example, as 12376324 + 109265209 = 3518^2 + 10453^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121641533 - 2² = 121641529 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121641833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125966 + ... + 126927.

It is an arithmetic number, because the mean of its divisors is an integer number (16817451).

Almost surely, 2^121641533 is an apocalyptic number.

121641533 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

121641533 is a deficient number, since it is larger than the sum of its proper divisors (12898075).

121641533 is a wasteful number, since it uses less digits than its factorization.

121641533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252943.

The product of its digits is 2160, while the sum is 26.

The square root of 121641533 is about 11029.1220412143. The cubic root of 121641533 is about 495.4813302662.

Adding to 121641533 its reverse (335146121), we get a palindrome (456787654).

The spelling of 121641533 in words is "one hundred twenty-one million, six hundred forty-one thousand, five hundred thirty-three".