30642869 has 2 divisors, whose sum is σ = 30642870. Its totient is φ = 30642868.

The previous prime is 30642847. The next prime is 30642929. The reversal of 30642869 is 96824603.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18601969 + 12040900 = 4313^2 + 3470^2 .

It is an emirp because it is prime and its reverse (96824603) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30642869 - 2⁸ = 30642613 is a prime.

It is a super-2 number, since 2×30642869² = 1877970841102322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30642169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15321434 + 15321435.

It is an arithmetic number, because the mean of its divisors is an integer number (15321435).

Almost surely, 2^30642869 is an apocalyptic number.

It is an amenable number.

30642869 is a deficient number, since it is larger than the sum of its proper divisors (1).

30642869 is an equidigital number, since it uses as much as digits as its factorization.

30642869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 30642869 is about 5535.6001481321. The cubic root of 30642869 is about 312.9270755947.

The spelling of 30642869 in words is "thirty million, six hundred forty-two thousand, eight hundred sixty-nine".