1220523541 has 4 divisors (see below), whose sum is σ = 1220611084. Its totient is φ = 1220436000.

The previous prime is 1220523511. The next prime is 1220523553. The reversal of 1220523541 is 1453250221.

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 2 ways, for example, as 790790641 + 429732900 = 28121^2 + 20730^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220523541 - 2¹¹ = 1220521493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220523511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17670 + ... + 52471.

It is an arithmetic number, because the mean of its divisors is an integer number (305152771).

Almost surely, 2^1220523541 is an apocalyptic number.

It is an amenable number.

1220523541 is a deficient number, since it is larger than the sum of its proper divisors (87543).

1220523541 is an equidigital number, since it uses as much as digits as its factorization.

1220523541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87542.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1220523541 is about 34935.9920569032. The cubic root of 1220523541 is about 1068.6825550453.

Adding to 1220523541 its reverse (1453250221), we get a palindrome (2673773762).

The spelling of 1220523541 in words is "one billion, two hundred twenty million, five hundred twenty-three thousand, five hundred forty-one".