30121493 has 2 divisors, whose sum is σ = 30121494. Its totient is φ = 30121492.

The previous prime is 30121453. The next prime is 30121499. The reversal of 30121493 is 39412103.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30052324 + 69169 = 5482^2 + 263^2 .

It is a cyclic number.

It is not a de Polignac number, because 30121493 - 2¹⁴ = 30105109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30121499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15060746 + 15060747.

It is an arithmetic number, because the mean of its divisors is an integer number (15060747).

Almost surely, 2^30121493 is an apocalyptic number.

It is an amenable number.

30121493 is a deficient number, since it is larger than the sum of its proper divisors (1).

30121493 is an equidigital number, since it uses as much as digits as its factorization.

30121493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 30121493 is about 5488.3051117809. The cubic root of 30121493 is about 311.1421378590.

Adding to 30121493 its reverse (39412103), we get a palindrome (69533596).

The spelling of 30121493 in words is "thirty million, one hundred twenty-one thousand, four hundred ninety-three".