1213906955 has 8 divisors (see below), whose sum is σ = 1474239312. Its totient is φ = 959424928.

The previous prime is 1213906943. The next prime is 1213906957. The reversal of 1213906955 is 5596093121.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1213906955 - 2⁶ = 1213906891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213906957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1462124 + ... + 1462953.

It is an arithmetic number, because the mean of its divisors is an integer number (184279914).

Almost surely, 2^1213906955 is an apocalyptic number.

1213906955 is a deficient number, since it is larger than the sum of its proper divisors (260332357).

1213906955 is an equidigital number, since it uses as much as digits as its factorization.

1213906955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2925165.

The product of its (nonzero) digits is 72900, while the sum is 41.

The square root of 1213906955 is about 34841.1675321020. The cubic root of 1213906955 is about 1066.7479081459.

The spelling of 1213906955 in words is "one billion, two hundred thirteen million, nine hundred six thousand, nine hundred fifty-five".