1946181901 has 2 divisors, whose sum is σ = 1946181902. Its totient is φ = 1946181900.

The previous prime is 1946181899. The next prime is 1946181917. The reversal of 1946181901 is 1091816491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1162741801 + 783440100 = 34099^2 + 27990^2 .

It is a cyclic number.

It is not a de Polignac number, because 1946181901 - 2¹ = 1946181899 is a prime.

Together with 1946181899, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1946181931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 973090950 + 973090951.

It is an arithmetic number, because the mean of its divisors is an integer number (973090951).

Almost surely, 2^1946181901 is an apocalyptic number.

It is an amenable number.

1946181901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1946181901 is an equidigital number, since it uses as much as digits as its factorization.

1946181901 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 40.

The square root of 1946181901 is about 44115.5516909853. The cubic root of 1946181901 is about 1248.5170469225.

The spelling of 1946181901 in words is "one billion, nine hundred forty-six million, one hundred eighty-one thousand, nine hundred one".