2135545978 has 4 divisors (see below), whose sum is σ = 3203318970. Its totient is φ = 1067772988.

The previous prime is 2135545963. The next prime is 2135545987. The reversal of 2135545978 is 8795455312.

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

It can be written as a sum of positive squares in only one way, i.e., 1260747049 + 874798929 = 35507^2 + 29577^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 533886493 + ... + 533886496.

Almost surely, 2^2135545978 is an apocalyptic number.

2135545978 is a deficient number, since it is larger than the sum of its proper divisors (1067772992).

2135545978 is a wasteful number, since it uses less digits than its factorization.

2135545978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1067772991.

The product of its digits is 1512000, while the sum is 49.

The square root of 2135545978 is about 46211.9679087571. The cubic root of 2135545978 is about 1287.7640850563.

The spelling of 2135545978 in words is "two billion, one hundred thirty-five million, five hundred forty-five thousand, nine hundred seventy-eight".