1215045413 has 4 divisors (see below), whose sum is σ = 1216091328. Its totient is φ = 1213999500.

The previous prime is 1215045409. The next prime is 1215045427. The reversal of 1215045413 is 3145405121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1215045413 - 2² = 1215045409 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215045443) 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, 521213 + ... + 523538.

It is an arithmetic number, because the mean of its divisors is an integer number (304022832).

Almost surely, 2^1215045413 is an apocalyptic number.

It is an amenable number.

1215045413 is a deficient number, since it is larger than the sum of its proper divisors (1045915).

1215045413 is a wasteful number, since it uses less digits than its factorization.

1215045413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045914.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 1215045413 is about 34857.5015312343. The cubic root of 1215045413 is about 1067.0812857654.

The spelling of 1215045413 in words is "one billion, two hundred fifteen million, forty-five thousand, four hundred thirteen".