1901563 has 2 divisors, whose sum is σ = 1901564. Its totient is φ = 1901562.

The previous prime is 1901551. The next prime is 1901567. The reversal of 1901563 is 3651091.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1901563 - 2⁵ = 1901531 is a prime.

It is not a weakly prime, because it can be changed into another prime (1901567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 950781 + 950782.

It is an arithmetic number, because the mean of its divisors is an integer number (950782).

2^1901563 is an apocalyptic number.

1901563 is a deficient number, since it is larger than the sum of its proper divisors (1).

1901563 is an equidigital number, since it uses as much as digits as its factorization.

1901563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 1901563 is about 1378.9717183467. The cubic root of 1901563 is about 123.8901863372.

The spelling of 1901563 in words is "one million, nine hundred one thousand, five hundred sixty-three".