1219661226 has 96 divisors (see below), whose sum is σ = 3316360320. Its totient is φ = 327960576.

The previous prime is 1219661189. The next prime is 1219661257. The reversal of 1219661226 is 6221669121.

1219661226 is a `hidden beast` number, since 1 + 2 + 19 + 6 + 612 + 26 = 666.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 47290 + ... + 68378.

It is an arithmetic number, because the mean of its divisors is an integer number (34545420).

Almost surely, 2^1219661226 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1219661226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1658180160).

1219661226 is an abundant number, since it is smaller than the sum of its proper divisors (2096699094).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1219661226 is a wasteful number, since it uses less digits than its factorization.

1219661226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21130 (or 21118 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 1219661226 is about 34923.6485207373. The cubic root of 1219661226 is about 1068.4308165964.

The spelling of 1219661226 in words is "one billion, two hundred nineteen million, six hundred sixty-one thousand, two hundred twenty-six".