1021780541 has 2 divisors, whose sum is σ = 1021780542. Its totient is φ = 1021780540.

The previous prime is 1021780469. The next prime is 1021780583. The reversal of 1021780541 is 1450871201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 538704100 + 483076441 = 23210^2 + 21979^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021780541 - 2¹⁸ = 1021518397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021783541) 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 as a sum of consecutive naturals, namely, 510890270 + 510890271.

It is an arithmetic number, because the mean of its divisors is an integer number (510890271).

Almost surely, 2^1021780541 is an apocalyptic number.

It is an amenable number.

1021780541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021780541 is an equidigital number, since it uses as much as digits as its factorization.

1021780541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 1021780541 is about 31965.3021415409. The cubic root of 1021780541 is about 1007.2080988086.

The spelling of 1021780541 in words is "one billion, twenty-one million, seven hundred eighty thousand, five hundred forty-one".