1801291421 has 2 divisors, whose sum is σ = 1801291422. Its totient is φ = 1801291420.

The previous prime is 1801291411. The next prime is 1801291433. The reversal of 1801291421 is 1241921081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1268143321 + 533148100 = 35611^2 + 23090^2 .

It is an emirp because it is prime and its reverse (1241921081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1801291421 - 2¹⁸ = 1801029277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1801291411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900645710 + 900645711.

It is an arithmetic number, because the mean of its divisors is an integer number (900645711).

Almost surely, 2^1801291421 is an apocalyptic number.

It is an amenable number.

1801291421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1801291421 is an equidigital number, since it uses as much as digits as its factorization.

1801291421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 1801291421 is about 42441.6236847744. The cubic root of 1801291421 is about 1216.7312437691.

The spelling of 1801291421 in words is "one billion, eight hundred one million, two hundred ninety-one thousand, four hundred twenty-one".