30729953 has 2 divisors, whose sum is σ = 30729954. Its totient is φ = 30729952.

The previous prime is 30729899. The next prime is 30729961. The reversal of 30729953 is 35992703.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26697889 + 4032064 = 5167^2 + 2008^2 .

It is an emirp because it is prime and its reverse (35992703) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30729953 - 2⁶ = 30729889 is a prime.

It is a super-2 number, since 2×30729953² = 1888660022764418, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (30729253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15364976 + 15364977.

It is an arithmetic number, because the mean of its divisors is an integer number (15364977).

Almost surely, 2^30729953 is an apocalyptic number.

It is an amenable number.

30729953 is a deficient number, since it is larger than the sum of its proper divisors (1).

30729953 is an equidigital number, since it uses as much as digits as its factorization.

30729953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51030, while the sum is 38.

The square root of 30729953 is about 5543.4603813863. The cubic root of 30729953 is about 313.2232311462.

The spelling of 30729953 in words is "thirty million, seven hundred twenty-nine thousand, nine hundred fifty-three".