1215331 has 4 divisors (see below), whose sum is σ = 1308832. Its totient is φ = 1121832.

The previous prime is 1215329. The next prime is 1215349. The reversal of 1215331 is 1335121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1335121 = 359 ⋅3719.

It is a cyclic number.

It is not a de Polignac number, because 1215331 - 2¹ = 1215329 is a prime.

It is a super-3 number, since 3×1215331³ = 5385238997433329073, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215301) 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, 46731 + ... + 46756.

It is an arithmetic number, because the mean of its divisors is an integer number (327208).

2^1215331 is an apocalyptic number.

1215331 is a deficient number, since it is larger than the sum of its proper divisors (93501).

1215331 is an equidigital number, since it uses as much as digits as its factorization.

1215331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93500.

The product of its digits is 90, while the sum is 16.

The square root of 1215331 is about 1102.4205186770. The cubic root of 1215331 is about 106.7164882276.

The spelling of 1215331 in words is "one million, two hundred fifteen thousand, three hundred thirty-one".