4135540621 has 12 divisors (see below), whose sum is σ = 4339403100. Its totient is φ = 3936558080.

The previous prime is 4135540597. The next prime is 4135540637. The reversal of 4135540621 is 1260455314.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3186038025 + 949502596 = 56445^2 + 30814^2 .

It is not a de Polignac number, because 4135540621 - 2⁹ = 4135540109 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 (4135540681) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 132045 + ... + 160333.

It is an arithmetic number, because the mean of its divisors is an integer number (361616925).

Almost surely, 2^4135540621 is an apocalyptic number.

It is an amenable number.

4135540621 is a deficient number, since it is larger than the sum of its proper divisors (203862479).

4135540621 is an equidigital number, since it uses as much as digits as its factorization.

4135540621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28460 (or 28389 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 4135540621 is about 64308.1691622456. The cubic root of 4135540621 is about 1605.1320396154.

Adding to 4135540621 its reverse (1260455314), we get a palindrome (5395995935).

The spelling of 4135540621 in words is "four billion, one hundred thirty-five million, five hundred forty thousand, six hundred twenty-one".