1215322491 has 8 divisors (see below), whose sum is σ = 1640942080. Its totient is φ = 799958952.

The previous prime is 1215322487. The next prime is 1215322499. The reversal of 1215322491 is 1942235121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1215322491 - 2² = 1215322487 is a prime.

It is a super-3 number, since 3×1215322491³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215322499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2563735 + ... + 2564208.

It is an arithmetic number, because the mean of its divisors is an integer number (205117760).

Almost surely, 2^1215322491 is an apocalyptic number.

1215322491 is a deficient number, since it is larger than the sum of its proper divisors (425619589).

1215322491 is an equidigital number, since it uses as much as digits as its factorization.

1215322491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5128025.

The product of its digits is 4320, while the sum is 30.

The square root of 1215322491 is about 34861.4757432900. The cubic root of 1215322491 is about 1067.1623917262.

The spelling of 1215322491 in words is "one billion, two hundred fifteen million, three hundred twenty-two thousand, four hundred ninety-one".