30642709 has 2 divisors, whose sum is σ = 30642710. Its totient is φ = 30642708.

The previous prime is 30642707. The next prime is 30642713. The reversal of 30642709 is 90724603.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28654609 + 1988100 = 5353^2 + 1410^2 .

It is a cyclic number.

It is not a de Polignac number, because 30642709 - 2¹ = 30642707 is a prime.

It is a super-2 number, since 2×30642709² = 1877951229717362, which contains 22 as substring.

Together with 30642707, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30642701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15321354 + 15321355.

It is an arithmetic number, because the mean of its divisors is an integer number (15321355).

Almost surely, 2^30642709 is an apocalyptic number.

It is an amenable number.

30642709 is a deficient number, since it is larger than the sum of its proper divisors (1).

30642709 is an equidigital number, since it uses as much as digits as its factorization.

30642709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 30642709 is about 5535.5856962023. The cubic root of 30642709 is about 312.9265309501.

The spelling of 30642709 in words is "thirty million, six hundred forty-two thousand, seven hundred nine".