1801211441 has 2 divisors, whose sum is σ = 1801211442. Its totient is φ = 1801211440.

The previous prime is 1801211437. The next prime is 1801211491. The reversal of 1801211441 is 1441121081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1474867216 + 326344225 = 38404^2 + 18065^2 .

It is a cyclic number.

It is not a de Polignac number, because 1801211441 - 2² = 1801211437 is a prime.

It is not a weakly prime, because it can be changed into another prime (1801211491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900605720 + 900605721.

It is an arithmetic number, because the mean of its divisors is an integer number (900605721).

Almost surely, 2^1801211441 is an apocalyptic number.

It is an amenable number.

1801211441 is a deficient number, since it is larger than the sum of its proper divisors (1).

1801211441 is an equidigital number, since it uses as much as digits as its factorization.

1801211441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 1801211441 is about 42440.6814389213. The cubic root of 1801211441 is about 1216.7132352810.

The spelling of 1801211441 in words is "one billion, eight hundred one million, two hundred eleven thousand, four hundred forty-one".