1200780541 has 4 divisors (see below), whose sum is σ = 1200865500. Its totient is φ = 1200695584.

The previous prime is 1200780523. The next prime is 1200780589. The reversal of 1200780541 is 1450870021.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1450870021 = 19181 ⋅75641.

It can be written as a sum of positive squares in 2 ways, for example, as 483076441 + 717704100 = 21979^2 + 26790^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200780541 - 2⁹ = 1200780029 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 (1200780041) 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, 15616 + ... + 51433.

It is an arithmetic number, because the mean of its divisors is an integer number (300216375).

Almost surely, 2^1200780541 is an apocalyptic number.

It is an amenable number.

1200780541 is a deficient number, since it is larger than the sum of its proper divisors (84959).

1200780541 is an equidigital number, since it uses as much as digits as its factorization.

1200780541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84958.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 1200780541 is about 34652.2804588673. The cubic root of 1200780541 is about 1062.8889216295. Note that the first 3 decimals are identical.

The spelling of 1200780541 in words is "one billion, two hundred million, seven hundred eighty thousand, five hundred forty-one".