1946109421 has 2 divisors, whose sum is σ = 1946109422. Its totient is φ = 1946109420.

The previous prime is 1946109379. The next prime is 1946109443. The reversal of 1946109421 is 1249016491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1914062500 + 32046921 = 43750^2 + 5661^2 .

It is an emirp because it is prime and its reverse (1249016491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1946109421 - 2¹⁹ = 1945585133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1946109521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 973054710 + 973054711.

It is an arithmetic number, because the mean of its divisors is an integer number (973054711).

Almost surely, 2^1946109421 is an apocalyptic number.

It is an amenable number.

1946109421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1946109421 is an equidigital number, since it uses as much as digits as its factorization.

1946109421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 1946109421 is about 44114.7302043206. The cubic root of 1946109421 is about 1248.5015475767.

The spelling of 1946109421 in words is "one billion, nine hundred forty-six million, one hundred nine thousand, four hundred twenty-one".