30729641 has 2 divisors, whose sum is σ = 30729642. Its totient is φ = 30729640.

The previous prime is 30729583. The next prime is 30729667. The reversal of 30729641 is 14692703.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17977600 + 12752041 = 4240^2 + 3571^2 .

It is an emirp because it is prime and its reverse (14692703) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30729641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30729598 and 30729607.

It is not a weakly prime, because it can be changed into another prime (30729691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15364820 + 15364821.

It is an arithmetic number, because the mean of its divisors is an integer number (15364821).

Almost surely, 2^30729641 is an apocalyptic number.

It is an amenable number.

30729641 is a deficient number, since it is larger than the sum of its proper divisors (1).

30729641 is an equidigital number, since it uses as much as digits as its factorization.

30729641 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 32.

The square root of 30729641 is about 5543.4322400477. The cubic root of 30729641 is about 313.2221710949. Note that the first 3 decimals are identical.

The spelling of 30729641 in words is "thirty million, seven hundred twenty-nine thousand, six hundred forty-one".