1215446149 has 2 divisors, whose sum is σ = 1215446150. Its totient is φ = 1215446148.

The previous prime is 1215446147. The next prime is 1215446203. The reversal of 1215446149 is 9416445121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1204437025 + 11009124 = 34705^2 + 3318^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215446149 - 2¹ = 1215446147 is a prime.

It is a super-2 number, since 2×1215446149² = 2954618682237860402, which contains 22 as substring.

Together with 1215446147, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215446147) 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 as a sum of consecutive naturals, namely, 607723074 + 607723075.

It is an arithmetic number, because the mean of its divisors is an integer number (607723075).

Almost surely, 2^1215446149 is an apocalyptic number.

It is an amenable number.

1215446149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215446149 is an equidigital number, since it uses as much as digits as its factorization.

1215446149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 37.

The square root of 1215446149 is about 34863.2492605035. The cubic root of 1215446149 is about 1067.1985847785.

The spelling of 1215446149 in words is "one billion, two hundred fifteen million, four hundred forty-six thousand, one hundred forty-nine".