1219647955 has 4 divisors (see below), whose sum is σ = 1463577552. Its totient is φ = 975718360.

The previous prime is 1219647937. The next prime is 1219647959. The reversal of 1219647955 is 5597469121.

It is a happy number.

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

It is not a de Polignac number, because 1219647955 - 2²³ = 1211259347 is a prime.

It is a super-2 number, since 2×1219647955² = 2975082268271364050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1219647899 and 1219647908.

It is not an unprimeable number, because it can be changed into a prime (1219647959) 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, 121964791 + ... + 121964800.

It is an arithmetic number, because the mean of its divisors is an integer number (365894388).

Almost surely, 2^1219647955 is an apocalyptic number.

1219647955 is a deficient number, since it is larger than the sum of its proper divisors (243929597).

1219647955 is an equidigital number, since it uses as much as digits as its factorization.

1219647955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243929596.

The product of its digits is 680400, while the sum is 49.

The square root of 1219647955 is about 34923.4585200263. The cubic root of 1219647955 is about 1068.4269414228.

The spelling of 1219647955 in words is "one billion, two hundred nineteen million, six hundred forty-seven thousand, nine hundred fifty-five".