Search a number
-
+
31240481 is a prime number
BaseRepresentation
bin111011100101…
…1000100100001
32011210011212212
41313023010201
530444143411
63033331505
7526353056
oct167130441
964704785
1031240481
11166a8488
12a566b95
13661a7bc
14421302d
152b2168b
hex1dcb121

31240481 has 2 divisors, whose sum is σ = 31240482. Its totient is φ = 31240480.

The previous prime is 31240439. The next prime is 31240493. The reversal of 31240481 is 18404213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25090081 + 6150400 = 5009^2 + 2480^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-31240481 is a prime.

It is a super-2 number, since 2×312404812 = 1951935306222722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15620240 + 15620241.

It is an arithmetic number, because the mean of its divisors is an integer number (15620241).

Almost surely, 231240481 is an apocalyptic number.

It is an amenable number.

31240481 is a deficient number, since it is larger than the sum of its proper divisors (1).

31240481 is an equidigital number, since it uses as much as digits as its factorization.

31240481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 31240481 is about 5589.3184736603. The cubic root of 31240481 is about 314.9482773899.

Adding to 31240481 its reverse (18404213), we get a palindrome (49644694).

The spelling of 31240481 in words is "thirty-one million, two hundred forty thousand, four hundred eighty-one".