1650431899 has 2 divisors, whose sum is σ = 1650431900. Its totient is φ = 1650431898.

The previous prime is 1650431821. The next prime is 1650431911. The reversal of 1650431899 is 9981340561.

It is a strong prime.

It is an emirp because it is prime and its reverse (9981340561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1650431899 - 2²¹ = 1648334747 is a prime.

It is not a weakly prime, because it can be changed into another prime (1650431399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 825215949 + 825215950.

It is an arithmetic number, because the mean of its divisors is an integer number (825215950).

Almost surely, 2^1650431899 is an apocalyptic number.

1650431899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1650431899 is an equidigital number, since it uses as much as digits as its factorization.

1650431899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 1650431899 is about 40625.5079845163. The cubic root of 1650431899 is about 1181.7688445548.

The spelling of 1650431899 in words is "one billion, six hundred fifty million, four hundred thirty-one thousand, eight hundred ninety-nine".