7121489 has 2 divisors, whose sum is σ = 7121490. Its totient is φ = 7121488.

The previous prime is 7121473. The next prime is 7121503. The reversal of 7121489 is 9841217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5452225 + 1669264 = 2335^2 + 1292^2 .

It is a cyclic number.

It is not a de Polignac number, because 7121489 - 2⁴ = 7121473 is a prime.

It is not a weakly prime, because it can be changed into another prime (7121089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3560744 + 3560745.

It is an arithmetic number, because the mean of its divisors is an integer number (3560745).

Almost surely, 2^7121489 is an apocalyptic number.

It is an amenable number.

7121489 is a deficient number, since it is larger than the sum of its proper divisors (1).

7121489 is an equidigital number, since it uses as much as digits as its factorization.

7121489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 32.

The square root of 7121489 is about 2668.6118114106. The cubic root of 7121489 is about 192.3934441485.

The spelling of 7121489 in words is "seven million, one hundred twenty-one thousand, four hundred eighty-nine".