1212631489 has 4 divisors (see below), whose sum is σ = 1212751300. Its totient is φ = 1212511680.

The previous prime is 1212631423. The next prime is 1212631501. The reversal of 1212631489 is 9841362121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9841362121 = 281 ⋅35022641.

It can be written as a sum of positive squares in 2 ways, for example, as 265038400 + 947593089 = 16280^2 + 30783^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212631489 - 2¹¹ = 1212629441 is a prime.

It is a super-3 number, since 3×1212631489³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212631289) 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, 43164 + ... + 65485.

It is an arithmetic number, because the mean of its divisors is an integer number (303187825).

Almost surely, 2^1212631489 is an apocalyptic number.

It is an amenable number.

1212631489 is a deficient number, since it is larger than the sum of its proper divisors (119811).

1212631489 is a wasteful number, since it uses less digits than its factorization.

1212631489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119810.

The product of its digits is 20736, while the sum is 37.

The square root of 1212631489 is about 34822.8587137817. The cubic root of 1212631489 is about 1066.3741624501.

The spelling of 1212631489 in words is "one billion, two hundred twelve million, six hundred thirty-one thousand, four hundred eighty-nine".