1231002215 has 16 divisors (see below), whose sum is σ = 1568222208. Its totient is φ = 924427776.

The previous prime is 1231002211. The next prime is 1231002263. The reversal of 1231002215 is 5122001321.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1231002215 - 2² = 1231002211 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231002193 and 1231002202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231002211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13649 + ... + 51461.

It is an arithmetic number, because the mean of its divisors is an integer number (98013888).

Almost surely, 2^1231002215 is an apocalyptic number.

1231002215 is a deficient number, since it is larger than the sum of its proper divisors (337219993).

1231002215 is a wasteful number, since it uses less digits than its factorization.

1231002215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38218.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 1231002215 is about 35085.6411513314. The cubic root of 1231002215 is about 1071.7321973311.

Adding to 1231002215 its reverse (5122001321), we get a palindrome (6353003536).

The spelling of 1231002215 in words is "one billion, two hundred thirty-one million, two thousand, two hundred fifteen".