121541653 has 4 divisors (see below), whose sum is σ = 128691180. Its totient is φ = 114392128.

The previous prime is 121541627. The next prime is 121541657. The reversal of 121541653 is 356145121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 356145121 = 17 ⋅20949713.

It can be written as a sum of positive squares in 2 ways, for example, as 66292164 + 55249489 = 8142^2 + 7433^2 .

It is a cyclic number.

It is not a de Polignac number, because 121541653 - 2⁹ = 121541141 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 (121541657) 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, 3574738 + ... + 3574771.

It is an arithmetic number, because the mean of its divisors is an integer number (32172795).

Almost surely, 2^121541653 is an apocalyptic number.

It is an amenable number.

121541653 is a deficient number, since it is larger than the sum of its proper divisors (7149527).

121541653 is an equidigital number, since it uses as much as digits as its factorization.

121541653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7149526.

The product of its digits is 3600, while the sum is 28.

The square root of 121541653 is about 11024.5930990672. The cubic root of 121541653 is about 495.3456797054.

Adding to 121541653 its reverse (356145121), we get a palindrome (477686774).

The spelling of 121541653 in words is "one hundred twenty-one million, five hundred forty-one thousand, six hundred fifty-three".