1978826101 has 16 divisors (see below), whose sum is σ = 2326302720. Its totient is φ = 1648067760.

The previous prime is 1978826099. The next prime is 1978826141. The reversal of 1978826101 is 1016288791.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1978826101 - 2¹ = 1978826099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978826141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24096 + ... + 67366.

It is an arithmetic number, because the mean of its divisors is an integer number (145393920).

Almost surely, 2^1978826101 is an apocalyptic number.

It is an amenable number.

1978826101 is a deficient number, since it is larger than the sum of its proper divisors (347476619).

1978826101 is a wasteful number, since it uses less digits than its factorization.

1978826101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43464.

The product of its (nonzero) digits is 48384, while the sum is 43.

The square root of 1978826101 is about 44483.9982578005. The cubic root of 1978826101 is about 1255.4590260682.

The spelling of 1978826101 in words is "one billion, nine hundred seventy-eight million, eight hundred twenty-six thousand, one hundred one".