1219542540241 has 9 divisors (see below), whose sum is σ = 1224591293649. Its totient is φ = 1214514530304.

The previous prime is 1219542540221. The next prime is 1219542540263. The reversal of 1219542540241 is 1420452459121.

The square root of 1219542540241 is 1104329.

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 501659141841 + 717883398400 = 708279^2 + 847280^2 .

It is not a de Polignac number, because 1219542540241 - 2²⁵ = 1219508985809 is a prime.

It is a super-2 number, since 2×1219542540241² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1219542540194 and 1219542540203.

It is not an unprimeable number, because it can be changed into a prime (1219542540221) 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, 283810405 + ... + 283814701.

Almost surely, 2^{1219542540241} is an apocalyptic number.

1219542540241 is the 1104329-th square number.

1219542540241 is the 552165-th centered octagonal number.

It is an amenable number.

1219542540241 is a deficient number, since it is larger than the sum of its proper divisors (5048753408).

1219542540241 is an frugal number, since it uses more digits than its factorization.

1219542540241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9108 (or 4554 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 40.

Adding to 1219542540241 its reverse (1420452459121), we get a palindrome (2639994999362).

The spelling of 1219542540241 in words is "one trillion, two hundred nineteen billion, five hundred forty-two million, five hundred forty thousand, two hundred forty-one".