1001921671 has 2 divisors, whose sum is σ = 1001921672. Its totient is φ = 1001921670.

The previous prime is 1001921659. The next prime is 1001921681. The reversal of 1001921671 is 1761291001.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1001921671 - 2⁹ = 1001921159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001921651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500960835 + 500960836.

It is an arithmetic number, because the mean of its divisors is an integer number (500960836).

Almost surely, 2^1001921671 is an apocalyptic number.

1001921671 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001921671 is an equidigital number, since it uses as much as digits as its factorization.

1001921671 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 28.

The square root of 1001921671 is about 31653.1463049094. The cubic root of 1001921671 is about 1000.6401471242.

The spelling of 1001921671 in words is "one billion, one million, nine hundred twenty-one thousand, six hundred seventy-one".