3131387878 has 16 divisors (see below), whose sum is σ = 4808010240. Its totient is φ = 1528870536.

The previous prime is 3131387869. The next prime is 3131387893. The reversal of 3131387878 is 8787831313.

It is a happy number.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 3325 + ... + 79207.

It is an arithmetic number, because the mean of its divisors is an integer number (300500640).

Almost surely, 2^3131387878 is an apocalyptic number.

3131387878 is a deficient number, since it is larger than the sum of its proper divisors (1676622362).

3131387878 is a wasteful number, since it uses less digits than its factorization.

3131387878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76371.

The product of its digits is 677376, while the sum is 49.

The square root of 3131387878 is about 55958.8051873876. The cubic root of 3131387878 is about 1463.0043654336.

The spelling of 3131387878 in words is "three billion, one hundred thirty-one million, three hundred eighty-seven thousand, eight hundred seventy-eight".