1213404413525 has 6 divisors (see below), whose sum is σ = 1504621472802. Its totient is φ = 970723530800.

The previous prime is 1213404413483. The next prime is 1213404413537. The reversal of 1213404413525 is 5253144043121.

It can be written as a sum of positive squares in 3 ways, for example, as 257063196196 + 956341217329 = 507014^2 + 977927^2 .

It is not a de Polignac number, because 1213404413525 - 2¹⁸ = 1213404151381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24268088246 + ... + 24268088295.

It is an arithmetic number, because the mean of its divisors is an integer number (250770245467).

Almost surely, 2^{1213404413525} is an apocalyptic number.

It is an amenable number.

1213404413525 is a deficient number, since it is larger than the sum of its proper divisors (291217059277).

1213404413525 is an equidigital number, since it uses as much as digits as its factorization.

1213404413525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48536176551 (or 48536176546 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

Adding to 1213404413525 its reverse (5253144043121), we get a palindrome (6466548456646).

The spelling of 1213404413525 in words is "one trillion, two hundred thirteen billion, four hundred four million, four hundred thirteen thousand, five hundred twenty-five".