30709813 has 2 divisors, whose sum is σ = 30709814. Its totient is φ = 30709812.

The previous prime is 30709793. The next prime is 30709823. The reversal of 30709813 is 31890703.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30217009 + 492804 = 5497^2 + 702^2 .

It is a cyclic number.

It is not a de Polignac number, because 30709813 - 2⁵ = 30709781 is a prime.

It is a super-2 number, since 2×30709813² = 1886185228989938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30709823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15354906 + 15354907.

It is an arithmetic number, because the mean of its divisors is an integer number (15354907).

Almost surely, 2^30709813 is an apocalyptic number.

It is an amenable number.

30709813 is a deficient number, since it is larger than the sum of its proper divisors (1).

30709813 is an equidigital number, since it uses as much as digits as its factorization.

30709813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 30709813 is about 5541.6435287738. The cubic root of 30709813 is about 313.1547887538.

The spelling of 30709813 in words is "thirty million, seven hundred nine thousand, eight hundred thirteen".