1215610165 has 48 divisors (see below), whose sum is σ = 1841656320. Its totient is φ = 753984000.

The previous prime is 1215610117. The next prime is 1215610169. The reversal of 1215610165 is 5610165121.

It is a happy number.

It is not a de Polignac number, because 1215610165 - 2¹¹ = 1215608117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215610169) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1011565 + ... + 1012765.

It is an arithmetic number, because the mean of its divisors is an integer number (38367840).

Almost surely, 2^1215610165 is an apocalyptic number.

It is an amenable number.

1215610165 is a deficient number, since it is larger than the sum of its proper divisors (626046155).

1215610165 is a wasteful number, since it uses less digits than its factorization.

1215610165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1474 (or 1463 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 1215610165 is about 34865.6014575971. The cubic root of 1215610165 is about 1067.2465862937.

Adding to 1215610165 its reverse (5610165121), we get a palindrome (6825775286).

The spelling of 1215610165 in words is "one billion, two hundred fifteen million, six hundred ten thousand, one hundred sixty-five".