5311187978 has 4 divisors (see below), whose sum is σ = 7966781970. Its totient is φ = 2655593988.

The previous prime is 5311187951. The next prime is 5311187989. The reversal of 5311187978 is 8797811135.

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., 4896780529 + 414407449 = 69977^2 + 20357^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1327796993 + ... + 1327796996.

Almost surely, 2^5311187978 is an apocalyptic number.

5311187978 is a deficient number, since it is larger than the sum of its proper divisors (2655593992).

5311187978 is a wasteful number, since it uses less digits than its factorization.

5311187978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2655593991.

The product of its digits is 423360, while the sum is 50.

The square root of 5311187978 is about 72877.8977331262. The cubic root of 5311187978 is about 1744.7393559852.

The spelling of 5311187978 in words is "five billion, three hundred eleven million, one hundred eighty-seven thousand, nine hundred seventy-eight".