30861869 has 2 divisors, whose sum is σ = 30861870. Its totient is φ = 30861868.

The previous prime is 30861841. The next prime is 30861881. The reversal of 30861869 is 96816803.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30858025 + 3844 = 5555^2 + 62^2 .

It is an emirp because it is prime and its reverse (96816803) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30861869 - 2¹² = 30857773 is a prime.

It is a super-2 number, since 2×30861869² = 1904909916346322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30861839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15430934 + 15430935.

It is an arithmetic number, because the mean of its divisors is an integer number (15430935).

Almost surely, 2^30861869 is an apocalyptic number.

It is an amenable number.

30861869 is a deficient number, since it is larger than the sum of its proper divisors (1).

30861869 is an equidigital number, since it uses as much as digits as its factorization.

30861869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 30861869 is about 5555.3459838249. The cubic root of 30861869 is about 313.6707876621.

The spelling of 30861869 in words is "thirty million, eight hundred sixty-one thousand, eight hundred sixty-nine".