1212865149 has 4 divisors (see below), whose sum is σ = 1617153536. Its totient is φ = 808576764.

The previous prime is 1212865123. The next prime is 1212865151. The reversal of 1212865149 is 9415682121.

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 not a de Polignac number, because 1212865149 - 2⁹ = 1212864637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212865109) 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, 202144189 + ... + 202144194.

It is an arithmetic number, because the mean of its divisors is an integer number (404288384).

Almost surely, 2^1212865149 is an apocalyptic number.

It is an amenable number.

1212865149 is a deficient number, since it is larger than the sum of its proper divisors (404288387).

1212865149 is an equidigital number, since it uses as much as digits as its factorization.

1212865149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404288386.

The product of its digits is 34560, while the sum is 39.

The square root of 1212865149 is about 34826.2135323380. The cubic root of 1212865149 is about 1066.4426506888.

It can be divided in two parts, 12128 and 65149, that added together give a palindrome (77277).

The spelling of 1212865149 in words is "one billion, two hundred twelve million, eight hundred sixty-five thousand, one hundred forty-nine".