30820957 has 2 divisors, whose sum is σ = 30820958. Its totient is φ = 30820956.

The previous prime is 30820901. The next prime is 30820961. The reversal of 30820957 is 75902803.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27394756 + 3426201 = 5234^2 + 1851^2 .

It is an emirp because it is prime and its reverse (75902803) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30820957 - 2²³ = 22432349 is a prime.

It is a super-3 number, since 3×30820957³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30820987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15410478 + 15410479.

It is an arithmetic number, because the mean of its divisors is an integer number (15410479).

Almost surely, 2^30820957 is an apocalyptic number.

It is an amenable number.

30820957 is a deficient number, since it is larger than the sum of its proper divisors (1).

30820957 is an equidigital number, since it uses as much as digits as its factorization.

30820957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 30820957 is about 5551.6625437791. The cubic root of 30820957 is about 313.5321206004.

The spelling of 30820957 in words is "thirty million, eight hundred twenty thousand, nine hundred fifty-seven".