5131978 has 4 divisors (see below), whose sum is σ = 7697970. Its totient is φ = 2565988.

The previous prime is 5131969. The next prime is 5131981. The reversal of 5131978 is 8791315.

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., 3972049 + 1159929 = 1993^2 + 1077^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1282993 + ... + 1282996.

Almost surely, 2^5131978 is an apocalyptic number.

5131978 is a deficient number, since it is larger than the sum of its proper divisors (2565992).

5131978 is a wasteful number, since it uses less digits than its factorization.

5131978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2565991.

The product of its digits is 7560, while the sum is 34.

The square root of 5131978 is about 2265.3869426656. The cubic root of 5131978 is about 172.4890758327.

The spelling of 5131978 in words is "five million, one hundred thirty-one thousand, nine hundred seventy-eight".