1901634491 has 2 divisors, whose sum is σ = 1901634492. Its totient is φ = 1901634490.

The previous prime is 1901634421. The next prime is 1901634521. The reversal of 1901634491 is 1944361091.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1901634491 - 2¹⁰ = 1901633467 is a prime.

It is not a weakly prime, because it can be changed into another prime (1901634421) 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, 950817245 + 950817246.

It is an arithmetic number, because the mean of its divisors is an integer number (950817246).

Almost surely, 2^1901634491 is an apocalyptic number.

1901634491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1901634491 is an equidigital number, since it uses as much as digits as its factorization.

1901634491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 1901634491 is about 43607.7343025294. The cubic root of 1901634491 is about 1238.9173890600.

The spelling of 1901634491 in words is "one billion, nine hundred one million, six hundred thirty-four thousand, four hundred ninety-one".