30813389 has 2 divisors, whose sum is σ = 30813390. Its totient is φ = 30813388.

The previous prime is 30813371. The next prime is 30813407. The reversal of 30813389 is 98331803.

It is a balanced prime because it is at equal distance from previous prime (30813371) and next prime (30813407).

It can be written as a sum of positive squares in only one way, i.e., 18966025 + 11847364 = 4355^2 + 3442^2 .

It is a cyclic number.

It is not a de Polignac number, because 30813389 - 2¹⁶ = 30747853 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30813089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15406694 + 15406695.

It is an arithmetic number, because the mean of its divisors is an integer number (15406695).

Almost surely, 2^30813389 is an apocalyptic number.

It is an amenable number.

30813389 is a deficient number, since it is larger than the sum of its proper divisors (1).

30813389 is an equidigital number, since it uses as much as digits as its factorization.

30813389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 30813389 is about 5550.9809043087. The cubic root of 30813389 is about 313.5064561871.

The spelling of 30813389 in words is "thirty million, eight hundred thirteen thousand, three hundred eighty-nine".