6990189949 has 2 divisors, whose sum is σ = 6990189950. Its totient is φ = 6990189948.

The previous prime is 6990189919. The next prime is 6990189953. The reversal of 6990189949 is 9499810996.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6309919225 + 680270724 = 79435^2 + 26082^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6990189949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6990189919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3495094974 + 3495094975.

It is an arithmetic number, because the mean of its divisors is an integer number (3495094975).

Almost surely, 2^6990189949 is an apocalyptic number.

It is an amenable number.

6990189949 is a deficient number, since it is larger than the sum of its proper divisors (1).

6990189949 is an equidigital number, since it uses as much as digits as its factorization.

6990189949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11337408, while the sum is 64.

The square root of 6990189949 is about 83607.3558306923. The cubic root of 6990189949 is about 1912.0371482143.

The spelling of 6990189949 in words is "six billion, nine hundred ninety million, one hundred eighty-nine thousand, nine hundred forty-nine".