1670584021 has 2 divisors, whose sum is σ = 1670584022. Its totient is φ = 1670584020.

The previous prime is 1670583979. The next prime is 1670584051. The reversal of 1670584021 is 1204850761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1353209796 + 317374225 = 36786^2 + 17815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1670584021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1670584051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835292010 + 835292011.

It is an arithmetic number, because the mean of its divisors is an integer number (835292011).

Almost surely, 2^1670584021 is an apocalyptic number.

It is an amenable number.

1670584021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1670584021 is an equidigital number, since it uses as much as digits as its factorization.

1670584021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 1670584021 is about 40872.7784839739. The cubic root of 1670584021 is about 1186.5592821002.

The spelling of 1670584021 in words is "one billion, six hundred seventy million, five hundred eighty-four thousand, twenty-one".