1864174021 has 2 divisors, whose sum is σ = 1864174022. Its totient is φ = 1864174020.

The previous prime is 1864174001. The next prime is 1864174061. The reversal of 1864174021 is 1204714681.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1173062500 + 691111521 = 34250^2 + 26289^2 .

It is a cyclic number.

It is not a de Polignac number, because 1864174021 - 2⁷ = 1864173893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1864174001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 932087010 + 932087011.

It is an arithmetic number, because the mean of its divisors is an integer number (932087011).

Almost surely, 2^1864174021 is an apocalyptic number.

It is an amenable number.

1864174021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1864174021 is an equidigital number, since it uses as much as digits as its factorization.

1864174021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 1864174021 is about 43176.0815845996. The cubic root of 1864174021 is about 1230.7281961616.

The spelling of 1864174021 in words is "one billion, eight hundred sixty-four million, one hundred seventy-four thousand, twenty-one".