1646970971 has 4 divisors (see below), whose sum is σ = 1647105744. Its totient is φ = 1646836200.

The previous prime is 1646970953. The next prime is 1646970979. The reversal of 1646970971 is 1790796461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1790796461 = 10247 ⋅174763.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1646970971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1646970979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47000 + ... + 74181.

It is an arithmetic number, because the mean of its divisors is an integer number (411776436).

Almost surely, 2^1646970971 is an apocalyptic number.

1646970971 is a deficient number, since it is larger than the sum of its proper divisors (134773).

1646970971 is a wasteful number, since it uses less digits than its factorization.

1646970971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134772.

The product of its (nonzero) digits is 571536, while the sum is 50.

The square root of 1646970971 is about 40582.8901262589. The cubic root of 1646970971 is about 1180.9422166642.

The spelling of 1646970971 in words is "one billion, six hundred forty-six million, nine hundred seventy thousand, nine hundred seventy-one".