4691989 has 2 divisors, whose sum is σ = 4691990. Its totient is φ = 4691988.

The previous prime is 4691969. The next prime is 4692001. The reversal of 4691989 is 9891964.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3179089 + 1512900 = 1783^2 + 1230^2 .

It is a cyclic number.

It is not a de Polignac number, because 4691989 - 2⁵ = 4691957 is a prime.

It is a super-2 number, since 2×4691989² = 44029521552242, which contains 22 as substring.

4691989 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4691909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2345994 + 2345995.

It is an arithmetic number, because the mean of its divisors is an integer number (2345995).

Almost surely, 2^4691989 is an apocalyptic number.

It is an amenable number.

4691989 is a deficient number, since it is larger than the sum of its proper divisors (1).

4691989 is an equidigital number, since it uses as much as digits as its factorization.

4691989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 46.

The square root of 4691989 is about 2166.0999515258. The cubic root of 4691989 is about 167.4116442005.

The spelling of 4691989 in words is "four million, six hundred ninety-one thousand, nine hundred eighty-nine".