30993139 has 2 divisors, whose sum is σ = 30993140. Its totient is φ = 30993138.

The previous prime is 30993107. The next prime is 30993251. The reversal of 30993139 is 93139903.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 30993139 - 2⁵ = 30993107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30993098 and 30993107.

It is not a weakly prime, because it can be changed into another prime (30991139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15496569 + 15496570.

It is an arithmetic number, because the mean of its divisors is an integer number (15496570).

Almost surely, 2^30993139 is an apocalyptic number.

30993139 is a deficient number, since it is larger than the sum of its proper divisors (1).

30993139 is an equidigital number, since it uses as much as digits as its factorization.

30993139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19683, while the sum is 37.

The square root of 30993139 is about 5567.1481927464. The cubic root of 30993139 is about 314.1148882468.

The spelling of 30993139 in words is "thirty million, nine hundred ninety-three thousand, one hundred thirty-nine".