1225355131540 has 24 divisors (see below), whose sum is σ = 2724613175592. Its totient is φ = 461310167040.

The previous prime is 1225355131531. The next prime is 1225355131543. The reversal of 1225355131540 is 451315535221.

It can be written as a sum of positive squares in 4 ways, for example, as 30382581636 + 1194972549904 = 174306^2 + 1093148^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1225355131540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225355131543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1801992501 + ... + 1801993180.

It is an arithmetic number, because the mean of its divisors is an integer number (113525548983).

Almost surely, 2^{1225355131540} is an apocalyptic number.

1225355131540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225355131540 is an abundant number, since it is smaller than the sum of its proper divisors (1499258044052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1225355131540 is a wasteful number, since it uses less digits than its factorization.

1225355131540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3603985707 (or 3603985705 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 37.

The spelling of 1225355131540 in words is "one trillion, two hundred twenty-five billion, three hundred fifty-five million, one hundred thirty-one thousand, five hundred forty".