1215750313 has 4 divisors (see below), whose sum is σ = 1235680708. Its totient is φ = 1195819920.

The previous prime is 1215750311. The next prime is 1215750391. The reversal of 1215750313 is 3130575121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 631416384 + 584333929 = 25128^2 + 24173^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215750313 - 2¹ = 1215750311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215750311) 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, 9965106 + ... + 9965227.

It is an arithmetic number, because the mean of its divisors is an integer number (308920177).

Almost surely, 2^1215750313 is an apocalyptic number.

It is an amenable number.

1215750313 is a deficient number, since it is larger than the sum of its proper divisors (19930395).

1215750313 is an equidigital number, since it uses as much as digits as its factorization.

1215750313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19930394.

The product of its (nonzero) digits is 3150, while the sum is 28.

The square root of 1215750313 is about 34867.6112316287. The cubic root of 1215750313 is about 1067.2875990929.

The spelling of 1215750313 in words is "one billion, two hundred fifteen million, seven hundred fifty thousand, three hundred thirteen".