1213745915 has 8 divisors (see below), whose sum is σ = 1466974320. Its totient is φ = 964010592.

The previous prime is 1213745899. The next prime is 1213745933. The reversal of 1213745915 is 5195473121.

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

It is not a de Polignac number, because 1213745915 - 2⁴ = 1213745899 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 872504 + ... + 873893.

It is an arithmetic number, because the mean of its divisors is an integer number (183371790).

Almost surely, 2^1213745915 is an apocalyptic number.

1213745915 is a deficient number, since it is larger than the sum of its proper divisors (253228405).

1213745915 is a wasteful number, since it uses less digits than its factorization.

1213745915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746541.

The product of its digits is 37800, while the sum is 38.

The square root of 1213745915 is about 34838.8563962711. The cubic root of 1213745915 is about 1066.7007335582.

The spelling of 1213745915 in words is "one billion, two hundred thirteen million, seven hundred forty-five thousand, nine hundred fifteen".