1215711045 has 16 divisors (see below), whose sum is σ = 2161264320. Its totient is φ = 648379152.

The previous prime is 1215711031. The next prime is 1215711073. The reversal of 1215711045 is 5401175121.

It is not a de Polignac number, because 1215711045 - 2⁶ = 1215710981 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4502499 + ... + 4502768.

It is an arithmetic number, because the mean of its divisors is an integer number (135079020).

Almost surely, 2^1215711045 is an apocalyptic number.

1215711045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1215711045 is a deficient number, since it is larger than the sum of its proper divisors (945553275).

1215711045 is an equidigital number, since it uses as much as digits as its factorization.

1215711045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9005281 (or 9005275 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 27.

The square root of 1215711045 is about 34867.0481257017. The cubic root of 1215711045 is about 1067.2761080545.

Adding to 1215711045 its reverse (5401175121), we get a palindrome (6616886166).

The spelling of 1215711045 in words is "one billion, two hundred fifteen million, seven hundred eleven thousand, forty-five".