6131978 has 4 divisors (see below), whose sum is σ = 9197970. Its totient is φ = 3065988.

The previous prime is 6131977. The next prime is 6131981. The reversal of 6131978 is 8791316.

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., 4870849 + 1261129 = 2207^2 + 1123^2 .

It is not an unprimeable number, because it can be changed into a prime (6131977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1532993 + ... + 1532996.

Almost surely, 2^6131978 is an apocalyptic number.

6131978 is a deficient number, since it is larger than the sum of its proper divisors (3065992).

6131978 is a wasteful number, since it uses less digits than its factorization.

6131978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3065991.

The product of its digits is 9072, while the sum is 35.

The square root of 6131978 is about 2476.2831017475. The cubic root of 6131978 is about 183.0347411324.

The spelling of 6131978 in words is "six million, one hundred thirty-one thousand, nine hundred seventy-eight".