1211963089 has 4 divisors (see below), whose sum is σ = 1275750640. Its totient is φ = 1148175540.

The previous prime is 1211963087. The next prime is 1211963119. The reversal of 1211963089 is 9803691121.

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.

It is a cyclic number.

It is not a de Polignac number, because 1211963089 - 2¹ = 1211963087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211963087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31893747 + ... + 31893784.

It is an arithmetic number, because the mean of its divisors is an integer number (318937660).

Almost surely, 2^1211963089 is an apocalyptic number.

1211963089 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1211963089 is a deficient number, since it is larger than the sum of its proper divisors (63787551).

1211963089 is an equidigital number, since it uses as much as digits as its factorization.

1211963089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63787550.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 1211963089 is about 34813.2602466359. The cubic root of 1211963089 is about 1066.1781986873.

The spelling of 1211963089 in words is "one billion, two hundred eleven million, nine hundred sixty-three thousand, eighty-nine".