1215001 has 4 divisors (see below), whose sum is σ = 1217232. Its totient is φ = 1212772.

The previous prime is 1214981. The next prime is 1215017. The reversal of 1215001 is 1005121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1005121 = 13 ⋅77317.

It is a cyclic number.

It is not a de Polignac number, because 1215001 - 2⁹ = 1214489 is a prime.

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, 306 + ... + 1588.

It is an arithmetic number, because the mean of its divisors is an integer number (304308).

2^1215001 is an apocalyptic number.

It is an amenable number.

1215001 is a deficient number, since it is larger than the sum of its proper divisors (2231).

1215001 is an equidigital number, since it uses as much as digits as its factorization.

1215001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2230.

The product of its (nonzero) digits is 10, while the sum is 10.

The square root of 1215001 is about 1102.2708378615. The cubic root of 1215001 is about 106.7068284095.

The spelling of 1215001 in words is "one million, two hundred fifteen thousand, one".