1650743971 has 6 divisors (see below), whose sum is σ = 1725636500. Its totient is φ = 1578971988.

The previous prime is 1650743957. The next prime is 1650743987. The reversal of 1650743971 is 1793470561.

It is not a de Polignac number, because 1650743971 - 2²⁷ = 1516526243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1650743371) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1559721 + ... + 1560778.

Almost surely, 2^1650743971 is an apocalyptic number.

1650743971 is a deficient number, since it is larger than the sum of its proper divisors (74892529).

1650743971 is an equidigital number, since it uses as much as digits as its factorization.

1650743971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3120545 (or 3120522 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 43.

The square root of 1650743971 is about 40629.3486410993. The cubic root of 1650743971 is about 1181.8433248015.

The spelling of 1650743971 in words is "one billion, six hundred fifty million, seven hundred forty-three thousand, nine hundred seventy-one".