541501621 has 2 divisors, whose sum is σ = 541501622. Its totient is φ = 541501620.

The previous prime is 541501579. The next prime is 541501657. The reversal of 541501621 is 126105145.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 271260900 + 270240721 = 16470^2 + 16439^2 .

It is a cyclic number.

It is not a de Polignac number, because 541501621 - 2²¹ = 539404469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (541501421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 270750810 + 270750811.

It is an arithmetic number, because the mean of its divisors is an integer number (270750811).

Almost surely, 2^541501621 is an apocalyptic number.

It is an amenable number.

541501621 is a deficient number, since it is larger than the sum of its proper divisors (1).

541501621 is an equidigital number, since it uses as much as digits as its factorization.

541501621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 541501621 is about 23270.1873864393. The cubic root of 541501621 is about 815.0794061164.

Adding to 541501621 its reverse (126105145), we get a palindrome (667606766).

The spelling of 541501621 in words is "five hundred forty-one million, five hundred one thousand, six hundred twenty-one".