30505121 has 2 divisors, whose sum is σ = 30505122. Its totient is φ = 30505120.

The previous prime is 30505099. The next prime is 30505133. The reversal of 30505121 is 12150503.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30030400 + 474721 = 5480^2 + 689^2 .

It is a cyclic number.

It is not a de Polignac number, because 30505121 - 2¹⁴ = 30488737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30505121.

It is not a weakly prime, because it can be changed into another prime (30505151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15252560 + 15252561.

It is an arithmetic number, because the mean of its divisors is an integer number (15252561).

Almost surely, 2^30505121 is an apocalyptic number.

It is an amenable number.

30505121 is a deficient number, since it is larger than the sum of its proper divisors (1).

30505121 is an equidigital number, since it uses as much as digits as its factorization.

30505121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 30505121 is about 5523.1441226895. The cubic root of 30505121 is about 312.4574738932.

Adding to 30505121 its reverse (12150503), we get a palindrome (42655624).

The spelling of 30505121 in words is "thirty million, five hundred five thousand, one hundred twenty-one".