30861161 has 2 divisors, whose sum is σ = 30861162. Its totient is φ = 30861160.

The previous prime is 30861157. The next prime is 30861167. The reversal of 30861161 is 16116803.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30858025 + 3136 = 5555^2 + 56^2 .

It is an emirp because it is prime and its reverse (16116803) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30861161 - 2² = 30861157 is a prime.

It is a super-2 number, since 2×30861161² = 1904822516535842, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30861161.

It is not a weakly prime, because it can be changed into another prime (30861167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15430580 + 15430581.

It is an arithmetic number, because the mean of its divisors is an integer number (15430581).

Almost surely, 2^30861161 is an apocalyptic number.

It is an amenable number.

30861161 is a deficient number, since it is larger than the sum of its proper divisors (1).

30861161 is an equidigital number, since it uses as much as digits as its factorization.

30861161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 30861161 is about 5555.2822610557. The cubic root of 30861161 is about 313.6683890105.

Adding to 30861161 its reverse (16116803), we get a palindrome (46977964).

The spelling of 30861161 in words is "thirty million, eight hundred sixty-one thousand, one hundred sixty-one".