1211487489 has 8 divisors (see below), whose sum is σ = 1794796320. Its totient is φ = 807658308.

The previous prime is 1211487469. The next prime is 1211487509. The reversal of 1211487489 is 9847841121.

1211487489 is a `hidden beast` number, since 1 + 21 + 148 + 7 + 489 = 666.

It is an interprime number because it is at equal distance from previous prime (1211487469) and next prime (1211487509).

It is not a de Polignac number, because 1211487489 - 2⁵ = 1211487457 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1211487469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22434927 + ... + 22434980.

It is an arithmetic number, because the mean of its divisors is an integer number (224349540).

Almost surely, 2^1211487489 is an apocalyptic number.

It is an amenable number.

1211487489 is a deficient number, since it is larger than the sum of its proper divisors (583308831).

1211487489 is an equidigital number, since it uses as much as digits as its factorization.

1211487489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44869916 (or 44869910 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 1211487489 is about 34806.4288458325. The cubic root of 1211487489 is about 1066.0387168007.

The spelling of 1211487489 in words is "one billion, two hundred eleven million, four hundred eighty-seven thousand, four hundred eighty-nine".