12154020541 has 4 divisors (see below), whose sum is σ = 13088945212. Its totient is φ = 11219095872.

The previous prime is 12154020493. The next prime is 12154020559. The reversal of 12154020541 is 14502045121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1817231641 + 10336788900 = 42629^2 + 101670^2 .

It is a cyclic number.

It is not a de Polignac number, because 12154020541 - 2⁹ = 12154020029 is a prime.

It is a super-2 number, since 2×12154020541² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12154080541) 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, 467462316 + ... + 467462341.

It is an arithmetic number, because the mean of its divisors is an integer number (3272236303).

Almost surely, 2^12154020541 is an apocalyptic number.

It is an amenable number.

12154020541 is a deficient number, since it is larger than the sum of its proper divisors (934924671).

12154020541 is an equidigital number, since it uses as much as digits as its factorization.

12154020541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 934924670.

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 12154020541 its reverse (14502045121), we get a palindrome (26656065662).

The spelling of 12154020541 in words is "twelve billion, one hundred fifty-four million, twenty thousand, five hundred forty-one".