31878421226 has 4 divisors (see below), whose sum is σ = 47817631842. Its totient is φ = 15939210612.

The previous prime is 31878421193. The next prime is 31878421247. The reversal of 31878421226 is 62212487813.

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., 25317583225 + 6560838001 = 159115^2 + 80999^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7969605305 + ... + 7969605308.

Almost surely, 2^31878421226 is an apocalyptic number.

31878421226 is a deficient number, since it is larger than the sum of its proper divisors (15939210616).

31878421226 is a wasteful number, since it uses less digits than its factorization.

31878421226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15939210615.

The product of its digits is 258048, while the sum is 44.

The spelling of 31878421226 in words is "thirty-one billion, eight hundred seventy-eight million, four hundred twenty-one thousand, two hundred twenty-six".