31013761 has 3 divisors (see below), whose sum is σ = 31019331. Its totient is φ = 31008192.

The previous prime is 31013747. The next prime is 31013779. The reversal of 31013761 is 16731013.

The square root of 31013761 is 5569.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 5612161 + 25401600 = 2369^2 + 5040^2 .

It is not a de Polignac number, because 31013761 - 2⁹ = 31013249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31013701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2785 + ... + 8353.

It is an arithmetic number, because the mean of its divisors is an integer number (10339777).

Almost surely, 2^31013761 is an apocalyptic number.

31013761 is the 5569-th square number.

31013761 is the 2785-th centered octagonal number.

It is an amenable number.

31013761 is a deficient number, since it is larger than the sum of its proper divisors (5570).

31013761 is an frugal number, since it uses more digits than its factorization.

31013761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11138 (or 5569 counting only the distinct ones).

The product of its (nonzero) digits is 378, while the sum is 22.

The cubic root of 31013761 is about 314.1845406631.

Adding to 31013761 its reverse (16731013), we get a palindrome (47744774).

The spelling of 31013761 in words is "thirty-one million, thirteen thousand, seven hundred sixty-one".