30268981 has 2 divisors, whose sum is σ = 30268982. Its totient is φ = 30268980.

The previous prime is 30268969. The next prime is 30269023. The reversal of 30268981 is 18986203.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30140100 + 128881 = 5490^2 + 359^2 .

It is an emirp because it is prime and its reverse (18986203) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30268981 - 2⁵ = 30268949 is a prime.

It is a super-2 number, since 2×30268981² = 1832422421556722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 30268981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30268921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15134490 + 15134491.

It is an arithmetic number, because the mean of its divisors is an integer number (15134491).

Almost surely, 2^30268981 is an apocalyptic number.

It is an amenable number.

30268981 is a deficient number, since it is larger than the sum of its proper divisors (1).

30268981 is an equidigital number, since it uses as much as digits as its factorization.

30268981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 30268981 is about 5501.7252748570. The cubic root of 30268981 is about 311.6491405716.

It can be divided in two parts, 30 and 268981, that added together give a triangular number (269011 = T₇₃₃).

The spelling of 30268981 in words is "thirty million, two hundred sixty-eight thousand, nine hundred eighty-one".