1215025145 has 8 divisors (see below), whose sum is σ = 1481932680. Its totient is φ = 956085120.

The previous prime is 1215025127. The next prime is 1215025169. The reversal of 1215025145 is 5415205121.

It can be written as a sum of positive squares in 4 ways, for example, as 142659136 + 1072366009 = 11944^2 + 32747^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1215025145 - 2⁶ = 1215025081 is a prime.

It is a super-2 number, since 2×1215025145² = 2952572205964542050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1991540 + ... + 1992149.

It is an arithmetic number, because the mean of its divisors is an integer number (185241585).

Almost surely, 2^1215025145 is an apocalyptic number.

It is an amenable number.

1215025145 is a deficient number, since it is larger than the sum of its proper divisors (266907535).

1215025145 is an equidigital number, since it uses as much as digits as its factorization.

1215025145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3983755.

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 1215025145 is about 34857.2108035052. The cubic root of 1215025145 is about 1067.0753524553.

The spelling of 1215025145 in words is "one billion, two hundred fifteen million, twenty-five thousand, one hundred forty-five".