1213211089 has 2 divisors, whose sum is σ = 1213211090. Its totient is φ = 1213211088.

The previous prime is 1213211081. The next prime is 1213211173. The reversal of 1213211089 is 9801123121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 980190864 + 233020225 = 31308^2 + 15265^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213211089 - 2³ = 1213211081 is a prime.

It is a super-2 number, since 2×1213211089² = 2943762292945131842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1213211081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606605544 + 606605545.

It is an arithmetic number, because the mean of its divisors is an integer number (606605545).

Almost surely, 2^1213211089 is an apocalyptic number.

It is an amenable number.

1213211089 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213211089 is an equidigital number, since it uses as much as digits as its factorization.

1213211089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 1213211089 is about 34831.1798393336. The cubic root of 1213211089 is about 1066.5440332431.

The spelling of 1213211089 in words is "one billion, two hundred thirteen million, two hundred eleven thousand, eighty-nine".