30100981 has 2 divisors, whose sum is σ = 30100982. Its totient is φ = 30100980.

The previous prime is 30100949. The next prime is 30101003. The reversal of 30100981 is 18900103.

It is an a-pointer prime, because the next prime (30101003) can be obtained adding 30100981 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22648081 + 7452900 = 4759^2 + 2730^2 .

It is an emirp because it is prime and its reverse (18900103) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30100981 - 2⁵ = 30100949 is a prime.

It is a super-2 number, since 2×30100981² = 1812138114324722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30100181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15050490 + 15050491.

It is an arithmetic number, because the mean of its divisors is an integer number (15050491).

Almost surely, 2^30100981 is an apocalyptic number.

It is an amenable number.

30100981 is a deficient number, since it is larger than the sum of its proper divisors (1).

30100981 is an equidigital number, since it uses as much as digits as its factorization.

30100981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 30100981 is about 5486.4360927655. The cubic root of 30100981 is about 311.0714950926.

The spelling of 30100981 in words is "thirty million, one hundred thousand, nine hundred eighty-one".