30955993 has 2 divisors, whose sum is σ = 30955994. Its totient is φ = 30955992.

The previous prime is 30955979. The next prime is 30956017. The reversal of 30955993 is 39955903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29192409 + 1763584 = 5403^2 + 1328^2 .

It is a cyclic number.

It is not a de Polignac number, because 30955993 - 2⁵ = 30955961 is a prime.

It is not a weakly prime, because it can be changed into another prime (30955933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15477996 + 15477997.

It is an arithmetic number, because the mean of its divisors is an integer number (15477997).

Almost surely, 2^30955993 is an apocalyptic number.

It is an amenable number.

30955993 is a deficient number, since it is larger than the sum of its proper divisors (1).

30955993 is an equidigital number, since it uses as much as digits as its factorization.

30955993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 164025, while the sum is 43.

The square root of 30955993 is about 5563.8110140442. The cubic root of 30955993 is about 313.9893467385.

The spelling of 30955993 in words is "thirty million, nine hundred fifty-five thousand, nine hundred ninety-three".