1654349891 has 2 divisors, whose sum is σ = 1654349892. Its totient is φ = 1654349890.

The previous prime is 1654349881. The next prime is 1654349927. The reversal of 1654349891 is 1989434561.

It is a weak prime.

It is an emirp because it is prime and its reverse (1989434561) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1654349891 is a prime.

It is not a weakly prime, because it can be changed into another prime (1654349881) 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, 827174945 + 827174946.

It is an arithmetic number, because the mean of its divisors is an integer number (827174946).

Almost surely, 2^1654349891 is an apocalyptic number.

1654349891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1654349891 is an equidigital number, since it uses as much as digits as its factorization.

1654349891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 933120, while the sum is 50.

The square root of 1654349891 is about 40673.7002373770. The cubic root of 1654349891 is about 1182.7032468023.

The spelling of 1654349891 in words is "one billion, six hundred fifty-four million, three hundred forty-nine thousand, eight hundred ninety-one".