30640997 has 2 divisors, whose sum is σ = 30640998. Its totient is φ = 30640996.

The previous prime is 30640979. The next prime is 30640999. The reversal of 30640997 is 79904603.

Together with previous prime (30640979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29658916 + 982081 = 5446^2 + 991^2 .

It is a cyclic number.

It is not a de Polignac number, because 30640997 - 2⁶ = 30640933 is a prime.

Together with 30640999, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30640997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30640999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15320498 + 15320499.

It is an arithmetic number, because the mean of its divisors is an integer number (15320499).

Almost surely, 2^30640997 is an apocalyptic number.

It is an amenable number.

30640997 is a deficient number, since it is larger than the sum of its proper divisors (1).

30640997 is an equidigital number, since it uses as much as digits as its factorization.

30640997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 30640997 is about 5535.4310581923. The cubic root of 30640997 is about 312.9207031342.

The spelling of 30640997 in words is "thirty million, six hundred forty thousand, nine hundred ninety-seven".