30999797 has 4 divisors (see below), whose sum is σ = 31011180. Its totient is φ = 30988416.

The previous prime is 30999781. The next prime is 30999803. The reversal of 30999797 is 79799903.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 152881 + 30846916 = 391^2 + 5554^2 .

It is a cyclic number.

It is not a de Polignac number, because 30999797 - 2⁴ = 30999781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30999707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1079 + ... + 7947.

It is an arithmetic number, because the mean of its divisors is an integer number (7752795).

Almost surely, 2^30999797 is an apocalyptic number.

It is an amenable number.

30999797 is a deficient number, since it is larger than the sum of its proper divisors (11383).

30999797 is an equidigital number, since it uses as much as digits as its factorization.

30999797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11382.

The product of its (nonzero) digits is 964467, while the sum is 53.

The square root of 30999797 is about 5567.7461328620. The cubic root of 30999797 is about 314.1373795384.

The spelling of 30999797 in words is "thirty million, nine hundred ninety-nine thousand, seven hundred ninety-seven".