1639974671 has 2 divisors, whose sum is σ = 1639974672. Its totient is φ = 1639974670.

The previous prime is 1639974653. The next prime is 1639974689. The reversal of 1639974671 is 1764799361.

It is a balanced prime because it is at equal distance from previous prime (1639974653) and next prime (1639974689).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1639974671 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1639974571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 819987335 + 819987336.

It is an arithmetic number, because the mean of its divisors is an integer number (819987336).

Almost surely, 2^1639974671 is an apocalyptic number.

1639974671 is a deficient number, since it is larger than the sum of its proper divisors (1).

1639974671 is an equidigital number, since it uses as much as digits as its factorization.

1639974671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1714608, while the sum is 53.

The square root of 1639974671 is about 40496.6007338888. The cubic root of 1639974671 is about 1179.2676368604.

The spelling of 1639974671 in words is "one billion, six hundred thirty-nine million, nine hundred seventy-four thousand, six hundred seventy-one".