31486538 has 4 divisors (see below), whose sum is σ = 47229810. Its totient is φ = 15743268.

The previous prime is 31486537. The next prime is 31486549. The reversal of 31486538 is 83568413.

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., 30063289 + 1423249 = 5483^2 + 1193^2 .

It is not an unprimeable number, because it can be changed into a prime (31486537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7871633 + ... + 7871636.

Almost surely, 2^31486538 is an apocalyptic number.

31486538 is a deficient number, since it is larger than the sum of its proper divisors (15743272).

31486538 is a wasteful number, since it uses less digits than its factorization.

31486538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15743271.

The product of its digits is 69120, while the sum is 38.

The square root of 31486538 is about 5611.2866617203. The cubic root of 31486538 is about 315.7729836136.

The spelling of 31486538 in words is "thirty-one million, four hundred eighty-six thousand, five hundred thirty-eight".