1225502541 has 20 divisors (see below), whose sum is σ = 1832938492. Its totient is φ = 815997888.

The previous prime is 1225502519. The next prime is 1225502543. The reversal of 1225502541 is 1452055221.

1225502541 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 539586441 + 685916100 = 23229^2 + 26190^2 .

It is not a de Polignac number, because 1225502541 - 2¹⁹ = 1224978253 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225502543) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 60225 + ... + 77961.

Almost surely, 2^1225502541 is an apocalyptic number.

It is an amenable number.

1225502541 is a deficient number, since it is larger than the sum of its proper divisors (607435951).

1225502541 is an equidigital number, since it uses as much as digits as its factorization.

1225502541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18602 (or 18593 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 1225502541 is about 35007.1784210039. The cubic root of 1225502541 is about 1070.1337769094.

Adding to 1225502541 its reverse (1452055221), we get a palindrome (2677557762).

The spelling of 1225502541 in words is "one billion, two hundred twenty-five million, five hundred two thousand, five hundred forty-one".