1215366749 has 32 divisors (see below), whose sum is σ = 1381416960. Its totient is φ = 1064145600.

The previous prime is 1215366743. The next prime is 1215366769. The reversal of 1215366749 is 9476635121.

It is a cyclic number.

It is not a de Polignac number, because 1215366749 - 2²⁰ = 1214318173 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 (1215366743) 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 31 ways as a sum of consecutive naturals, for example, 1189859 + ... + 1190879.

It is an arithmetic number, because the mean of its divisors is an integer number (43169280).

Almost surely, 2^1215366749 is an apocalyptic number.

1215366749 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1215366749 is a deficient number, since it is larger than the sum of its proper divisors (166050211).

1215366749 is a wasteful number, since it uses less digits than its factorization.

1215366749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1161.

The product of its digits is 272160, while the sum is 44.

The square root of 1215366749 is about 34862.1105069673. The cubic root of 1215366749 is about 1067.1753457364.

The spelling of 1215366749 in words is "one billion, two hundred fifteen million, three hundred sixty-six thousand, seven hundred forty-nine".