30640261 has 2 divisors, whose sum is σ = 30640262. Its totient is φ = 30640260.

The previous prime is 30640249. The next prime is 30640279. The reversal of 30640261 is 16204603.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20304036 + 10336225 = 4506^2 + 3215^2 .

It is a cyclic number.

It is not a de Polignac number, because 30640261 - 2¹¹ = 30638213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30640231) 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, 15320130 + 15320131.

It is an arithmetic number, because the mean of its divisors is an integer number (15320131).

Almost surely, 2^30640261 is an apocalyptic number.

It is an amenable number.

30640261 is a deficient number, since it is larger than the sum of its proper divisors (1).

30640261 is an equidigital number, since it uses as much as digits as its factorization.

30640261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 30640261 is about 5535.3645769723. The cubic root of 30640261 is about 312.9181976513.

Adding to 30640261 its reverse (16204603), we get a palindrome (46844864).

The spelling of 30640261 in words is "thirty million, six hundred forty thousand, two hundred sixty-one".