1213378959 has 8 divisors (see below), whose sum is σ = 1742287792. Its totient is φ = 746694720.

The previous prime is 1213378949. The next prime is 1213378963. The reversal of 1213378959 is 9598733121.

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

It is not a de Polignac number, because 1213378959 - 2¹² = 1213374863 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 (1213378939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15556102 + ... + 15556179.

It is an arithmetic number, because the mean of its divisors is an integer number (217785974).

Almost surely, 2^1213378959 is an apocalyptic number.

1213378959 is a deficient number, since it is larger than the sum of its proper divisors (528908833).

1213378959 is a wasteful number, since it uses less digits than its factorization.

1213378959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31112297.

The product of its digits is 408240, while the sum is 48.

The square root of 1213378959 is about 34833.5895221839. The cubic root of 1213378959 is about 1066.5932229489.

The spelling of 1213378959 in words is "one billion, two hundred thirteen million, three hundred seventy-eight thousand, nine hundred fifty-nine".