1815295434241 has 3 divisors (see below), whose sum is σ = 1815296781571. Its totient is φ = 1815294086912.

The previous prime is 1815295434163. The next prime is 1815295434287. The reversal of 1815295434241 is 1424345925181.

It is a happy number.

The square root of 1815295434241 is 1347329.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 809767816641 + 1005527617600 = 899871^2 + 1002760^2 .

It is not a de Polignac number, because 1815295434241 - 2²³ = 1815287045633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1815295434041) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 673665 + ... + 2020993.

Almost surely, 2^{1815295434241} is an apocalyptic number.

1815295434241 is the 1347329-th square number.

1815295434241 is the 673665-th centered octagonal number.

It is an amenable number.

1815295434241 is a deficient number, since it is larger than the sum of its proper divisors (1347330).

1815295434241 is an frugal number, since it uses more digits than its factorization.

1815295434241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2694658 (or 1347329 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 49.

Multiplying 1815295434241 by its sum of digits (49), we get a square (88949476277809 = 9431303²).

The spelling of 1815295434241 in words is "one trillion, eight hundred fifteen billion, two hundred ninety-five million, four hundred thirty-four thousand, two hundred forty-one".