3171487978 has 4 divisors (see below), whose sum is σ = 4757231970. Its totient is φ = 1585743988.

The previous prime is 3171487951. The next prime is 3171487981. The reversal of 3171487978 is 8797841713.

It is a happy number.

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., 2381147209 + 790340769 = 48797^2 + 28113^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 792871993 + ... + 792871996.

Almost surely, 2^3171487978 is an apocalyptic number.

3171487978 is a deficient number, since it is larger than the sum of its proper divisors (1585743992).

3171487978 is a wasteful number, since it uses less digits than its factorization.

3171487978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1585743991.

The product of its digits is 2370816, while the sum is 55.

The square root of 3171487978 is about 56315.9655692771. The cubic root of 3171487978 is about 1469.2229033214. Note that the first 3 decimals are identical.

The spelling of 3171487978 in words is "three billion, one hundred seventy-one million, four hundred eighty-seven thousand, nine hundred seventy-eight".