1213646149 has 4 divisors (see below), whose sum is σ = 1216673100. Its totient is φ = 1210619200.

The previous prime is 1213646131. The next prime is 1213646171. The reversal of 1213646149 is 9416463121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1063412100 + 150234049 = 32610^2 + 12257^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213646149 - 2²³ = 1205257541 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 (1213626149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1512874 + ... + 1513675.

It is an arithmetic number, because the mean of its divisors is an integer number (304168275).

Almost surely, 2^1213646149 is an apocalyptic number.

It is an amenable number.

1213646149 is a deficient number, since it is larger than the sum of its proper divisors (3026951).

1213646149 is an equidigital number, since it uses as much as digits as its factorization.

1213646149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3026950.

The product of its digits is 31104, while the sum is 37.

The square root of 1213646149 is about 34837.4245460252. The cubic root of 1213646149 is about 1066.6715063040.

It can be divided in two parts, 12136 and 46149, that added together give a palindrome (58285).

The spelling of 1213646149 in words is "one billion, two hundred thirteen million, six hundred forty-six thousand, one hundred forty-nine".