2131436578 has 16 divisors (see below), whose sum is σ = 3363656184. Its totient is φ = 1011623040.

The previous prime is 2131436569. The next prime is 2131436579. The reversal of 2131436578 is 8756341312.

It can be written as a sum of positive squares in 4 ways, for example, as 1440430209 + 691006369 = 37953^2 + 26287^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2131436578.

It is not an unprimeable number, because it can be changed into a prime (2131436579) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 348225 + ... + 354292.

Almost surely, 2^2131436578 is an apocalyptic number.

2131436578 is a deficient number, since it is larger than the sum of its proper divisors (1232219606).

2131436578 is a wasteful number, since it uses less digits than its factorization.

2131436578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702597.

The product of its digits is 120960, while the sum is 40.

The square root of 2131436578 is about 46167.4839903584. The cubic root of 2131436578 is about 1286.9375461105.

The spelling of 2131436578 in words is "two billion, one hundred thirty-one million, four hundred thirty-six thousand, five hundred seventy-eight".