1946198021 has 2 divisors, whose sum is σ = 1946198022. Its totient is φ = 1946198020.

The previous prime is 1946198003. The next prime is 1946198071. The reversal of 1946198021 is 1208916491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1399807396 + 546390625 = 37414^2 + 23375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1946198021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1946198021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1946198071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 973099010 + 973099011.

It is an arithmetic number, because the mean of its divisors is an integer number (973099011).

Almost surely, 2^1946198021 is an apocalyptic number.

It is an amenable number.

1946198021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1946198021 is an equidigital number, since it uses as much as digits as its factorization.

1946198021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 1946198021 is about 44115.7343926178. The cubic root of 1946198021 is about 1248.5204940205.

The spelling of 1946198021 in words is "one billion, nine hundred forty-six million, one hundred ninety-eight thousand, twenty-one".