30709121 has 2 divisors, whose sum is σ = 30709122. Its totient is φ = 30709120.

The previous prime is 30709109. The next prime is 30709139. The reversal of 30709121 is 12190703.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19891600 + 10817521 = 4460^2 + 3289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30709121 is a prime.

It is a super-2 number, since 2×30709121² = 1886100225185282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (30709621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15354560 + 15354561.

It is an arithmetic number, because the mean of its divisors is an integer number (15354561).

Almost surely, 2^30709121 is an apocalyptic number.

It is an amenable number.

30709121 is a deficient number, since it is larger than the sum of its proper divisors (1).

30709121 is an equidigital number, since it uses as much as digits as its factorization.

30709121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 30709121 is about 5541.5810920711. The cubic root of 30709121 is about 313.1524365769.

Adding to 30709121 its reverse (12190703), we get a palindrome (42899824).

The spelling of 30709121 in words is "thirty million, seven hundred nine thousand, one hundred twenty-one".