1225540525243 has 4 divisors (see below), whose sum is σ = 1255431757608. Its totient is φ = 1195649292880.

The previous prime is 1225540525123. The next prime is 1225540525247. The reversal of 1225540525243 is 3425250455221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1225540525243 - 2²⁵ = 1225506970811 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1225540525196 and 1225540525205.

It is not an unprimeable number, because it can be changed into a prime (1225540525247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14945616121 + ... + 14945616202.

It is an arithmetic number, because the mean of its divisors is an integer number (313857939402).

Almost surely, 2^{1225540525243} is an apocalyptic number.

1225540525243 is a deficient number, since it is larger than the sum of its proper divisors (29891232365).

1225540525243 is an equidigital number, since it uses as much as digits as its factorization.

1225540525243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29891232364.

The product of its (nonzero) digits is 480000, while the sum is 40.

The spelling of 1225540525243 in words is "one trillion, two hundred twenty-five billion, five hundred forty million, five hundred twenty-five thousand, two hundred forty-three".