7641989 has 2 divisors, whose sum is σ = 7641990. Its totient is φ = 7641988.

The previous prime is 7641983. The next prime is 7642007. The reversal of 7641989 is 9891467.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6041764 + 1600225 = 2458^2 + 1265^2 .

It is a cyclic number.

It is not a de Polignac number, because 7641989 - 2⁴ = 7641973 is a prime.

It is a super-2 number, since 2×7641989² = 116799991752242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7641983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3820994 + 3820995.

It is an arithmetic number, because the mean of its divisors is an integer number (3820995).

Almost surely, 2^7641989 is an apocalyptic number.

It is an amenable number.

7641989 is a deficient number, since it is larger than the sum of its proper divisors (1).

7641989 is an equidigital number, since it uses as much as digits as its factorization.

7641989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 44.

The square root of 7641989 is about 2764.4147662751. The cubic root of 7641989 is about 196.9709302877.

The spelling of 7641989 in words is "seven million, six hundred forty-one thousand, nine hundred eighty-nine".