541609155481 has 9 divisors (see below), whose sum is σ = 547829278941. Its totient is φ = 535458896544.

The previous prime is 541609155433. The next prime is 541609155487. The reversal of 541609155481 is 184551906145.

It is a happy number.

The square root of 541609155481 is 735941.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 14910607881 + 526698547600 = 122109^2 + 725740^2 .

It is not a de Polignac number, because 541609155481 - 2²⁷ = 541474937753 is a prime.

It is a super-2 number, since 2×541609155481² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (541609155487) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 65494615 + ... + 65502883.

Almost surely, 2^541609155481 is an apocalyptic number.

541609155481 is the 735941-st square number.

541609155481 is the 367971-st centered octagonal number.

It is an amenable number.

541609155481 is a deficient number, since it is larger than the sum of its proper divisors (6220123460).

541609155481 is an frugal number, since it uses more digits than its factorization.

541609155481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16716 (or 8358 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 49.

Multiplying 541609155481 by its sum of digits (49), we get a square (26538848618569 = 5151587²).

The spelling of 541609155481 in words is "five hundred forty-one billion, six hundred nine million, one hundred fifty-five thousand, four hundred eighty-one".