3640641989 has 2 divisors, whose sum is σ = 3640641990. Its totient is φ = 3640641988.

The previous prime is 3640641967. The next prime is 3640641997. The reversal of 3640641989 is 9891460463.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2812180900 + 828461089 = 53030^2 + 28783^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3640641989 is a prime.

It is a super-2 number, since 2×3640641989² = 26508548184139752242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3640641959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1820320994 + 1820320995.

It is an arithmetic number, because the mean of its divisors is an integer number (1820320995).

Almost surely, 2^3640641989 is an apocalyptic number.

It is an amenable number.

3640641989 is a deficient number, since it is larger than the sum of its proper divisors (1).

3640641989 is an equidigital number, since it uses as much as digits as its factorization.

3640641989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1119744, while the sum is 50.

The square root of 3640641989 is about 60337.7327134522. The cubic root of 3640641989 is about 1538.3647663382.

The spelling of 3640641989 in words is "three billion, six hundred forty million, six hundred forty-one thousand, nine hundred eighty-nine".