31140061 has 4 divisors (see below), whose sum is σ = 31212412. Its totient is φ = 31067712.

The previous prime is 31140049. The next prime is 31140071. The reversal of 31140061 is 16004113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5788836 + 25351225 = 2406^2 + 5035^2 .

It is a cyclic number.

It is not a de Polignac number, because 31140061 - 2⁵ = 31140029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31140071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35526 + ... + 36391.

It is an arithmetic number, because the mean of its divisors is an integer number (7803103).

Almost surely, 2^31140061 is an apocalyptic number.

It is an amenable number.

31140061 is a deficient number, since it is larger than the sum of its proper divisors (72351).

31140061 is an equidigital number, since it uses as much as digits as its factorization.

31140061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72350.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 31140061 is about 5580.3280369527. The cubic root of 31140061 is about 314.6104565750.

Adding to 31140061 its reverse (16004113), we get a palindrome (47144174).

The spelling of 31140061 in words is "thirty-one million, one hundred forty thousand, sixty-one".