30902281 has 2 divisors, whose sum is σ = 30902282. Its totient is φ = 30902280.

The previous prime is 30902273. The next prime is 30902293. The reversal of 30902281 is 18220903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30691600 + 210681 = 5540^2 + 459^2 .

It is a cyclic number.

It is not a de Polignac number, because 30902281 - 2³ = 30902273 is a prime.

It is a super-2 number, since 2×30902281² = 1909901942005922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (30902231) 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, 15451140 + 15451141.

It is an arithmetic number, because the mean of its divisors is an integer number (15451141).

Almost surely, 2^30902281 is an apocalyptic number.

It is an amenable number.

30902281 is a deficient number, since it is larger than the sum of its proper divisors (1).

30902281 is an equidigital number, since it uses as much as digits as its factorization.

30902281 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 25.

The square root of 30902281 is about 5558.9820111240. The cubic root of 30902281 is about 313.8076397650.

The spelling of 30902281 in words is "thirty million, nine hundred two thousand, two hundred eighty-one".