1210849889 has 4 divisors (see below), whose sum is σ = 1211716800. Its totient is φ = 1209982980.

The previous prime is 1210849883. The next prime is 1210849891. The reversal of 1210849889 is 9889480121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9889480121 = 139 ⋅71147339.

It is a cyclic number.

It is not a de Polignac number, because 1210849889 - 2⁴ = 1210849873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1210849883) 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 in 3 ways as a sum of consecutive naturals, for example, 431357 + ... + 434154.

It is an arithmetic number, because the mean of its divisors is an integer number (302929200).

Almost surely, 2^1210849889 is an apocalyptic number.

It is an amenable number.

1210849889 is a deficient number, since it is larger than the sum of its proper divisors (866911).

1210849889 is an equidigital number, since it uses as much as digits as its factorization.

1210849889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866910.

The product of its (nonzero) digits is 331776, while the sum is 50.

The square root of 1210849889 is about 34797.2684129085. The cubic root of 1210849889 is about 1065.8516669772.

The spelling of 1210849889 in words is "one billion, two hundred ten million, eight hundred forty-nine thousand, eight hundred eighty-nine".